diff --git a/account_manager/src/validator/exit.rs b/account_manager/src/validator/exit.rs
index ca8cab5bd..9e5b57a29 100644
--- a/account_manager/src/validator/exit.rs
+++ b/account_manager/src/validator/exit.rs
@@ -349,7 +349,7 @@ fn load_voting_keypair(
     password_file_path: Option<&PathBuf>,
     stdin_inputs: bool,
 ) -> Result<Keypair, String> {
-    let keystore = Keystore::from_json_file(&voting_keystore_path).map_err(|e| {
+    let keystore = Keystore::from_json_file(voting_keystore_path).map_err(|e| {
         format!(
             "Unable to read keystore JSON {:?}: {:?}",
             voting_keystore_path, e
diff --git a/account_manager/src/validator/import.rs b/account_manager/src/validator/import.rs
index c581866a2..8dc50a9df 100644
--- a/account_manager/src/validator/import.rs
+++ b/account_manager/src/validator/import.rs
@@ -176,7 +176,7 @@ pub fn cli_run(matches: &ArgMatches, validator_dir: PathBuf) -> Result<(), Strin
 
             let password = match keystore_password_path.as_ref() {
                 Some(path) => {
-                    let password_from_file: ZeroizeString = fs::read_to_string(&path)
+                    let password_from_file: ZeroizeString = fs::read_to_string(path)
                         .map_err(|e| format!("Unable to read {:?}: {:?}", path, e))?
                         .into();
                     password_from_file.without_newlines()
@@ -256,7 +256,7 @@ pub fn cli_run(matches: &ArgMatches, validator_dir: PathBuf) -> Result<(), Strin
             .ok_or_else(|| format!("Badly formatted file name: {:?}", src_keystore))?;
 
         // Copy the keystore to the new location.
-        fs::copy(&src_keystore, &dest_keystore)
+        fs::copy(src_keystore, &dest_keystore)
             .map_err(|e| format!("Unable to copy keystore: {:?}", e))?;
 
         // Register with slashing protection.
diff --git a/account_manager/src/wallet/create.rs b/account_manager/src/wallet/create.rs
index 9ebaeae5f..accee11b5 100644
--- a/account_manager/src/wallet/create.rs
+++ b/account_manager/src/wallet/create.rs
@@ -159,7 +159,7 @@ pub fn create_wallet_from_mnemonic(
         unknown => return Err(format!("--{} {} is not supported", TYPE_FLAG, unknown)),
     };
 
-    let mgr = WalletManager::open(&wallet_base_dir)
+    let mgr = WalletManager::open(wallet_base_dir)
         .map_err(|e| format!("Unable to open --{}: {:?}", WALLETS_DIR_FLAG, e))?;
 
     let wallet_password: PlainText = match wallet_password_path {
diff --git a/beacon_node/beacon_chain/src/head_tracker.rs b/beacon_node/beacon_chain/src/head_tracker.rs
index 84c800f3b..3fa577ff9 100644
--- a/beacon_node/beacon_chain/src/head_tracker.rs
+++ b/beacon_node/beacon_chain/src/head_tracker.rs
@@ -45,7 +45,7 @@ impl HeadTracker {
     /// Returns a `SszHeadTracker`, which contains all necessary information to restore the state
     /// of `Self` at some later point.
     pub fn to_ssz_container(&self) -> SszHeadTracker {
-        SszHeadTracker::from_map(&*self.0.read())
+        SszHeadTracker::from_map(&self.0.read())
     }
 
     /// Creates a new `Self` from the given `SszHeadTracker`, restoring `Self` to the same state of
diff --git a/beacon_node/beacon_chain/src/migrate.rs b/beacon_node/beacon_chain/src/migrate.rs
index 1c0d9c4ed..66f082742 100644
--- a/beacon_node/beacon_chain/src/migrate.rs
+++ b/beacon_node/beacon_chain/src/migrate.rs
@@ -588,7 +588,7 @@ impl<E: EthSpec, Hot: ItemStore<E>, Cold: ItemStore<E>> BackgroundMigrator<E, Ho
         let persisted_head = PersistedBeaconChain {
             _canonical_head_block_root: DUMMY_CANONICAL_HEAD_BLOCK_ROOT,
             genesis_block_root,
-            ssz_head_tracker: SszHeadTracker::from_map(&*head_tracker_lock),
+            ssz_head_tracker: SszHeadTracker::from_map(&head_tracker_lock),
         };
         drop(head_tracker_lock);
         kv_batch.push(persisted_head.as_kv_store_op(BEACON_CHAIN_DB_KEY));
diff --git a/beacon_node/beacon_chain/src/schema_change.rs b/beacon_node/beacon_chain/src/schema_change.rs
index 3ee77f7bb..fd55048c3 100644
--- a/beacon_node/beacon_chain/src/schema_change.rs
+++ b/beacon_node/beacon_chain/src/schema_change.rs
@@ -17,7 +17,6 @@ use crate::persisted_fork_choice::{
 };
 use crate::types::ChainSpec;
 use slog::{warn, Logger};
-use std::path::Path;
 use std::sync::Arc;
 use store::hot_cold_store::{HotColdDB, HotColdDBError};
 use store::metadata::{SchemaVersion, CURRENT_SCHEMA_VERSION};
@@ -27,7 +26,6 @@ use store::{Error as StoreError, StoreItem};
 pub fn migrate_schema<T: BeaconChainTypes>(
     db: Arc<HotColdDB<T::EthSpec, T::HotStore, T::ColdStore>>,
     deposit_contract_deploy_block: u64,
-    datadir: &Path,
     from: SchemaVersion,
     to: SchemaVersion,
     log: Logger,
@@ -42,21 +40,12 @@ pub fn migrate_schema<T: BeaconChainTypes>(
             migrate_schema::<T>(
                 db.clone(),
                 deposit_contract_deploy_block,
-                datadir,
                 from,
                 next,
                 log.clone(),
                 spec,
             )?;
-            migrate_schema::<T>(
-                db,
-                deposit_contract_deploy_block,
-                datadir,
-                next,
-                to,
-                log,
-                spec,
-            )
+            migrate_schema::<T>(db, deposit_contract_deploy_block, next, to, log, spec)
         }
         // Downgrade across multiple versions by recursively migrating one step at a time.
         (_, _) if to.as_u64() + 1 < from.as_u64() => {
@@ -64,21 +53,12 @@ pub fn migrate_schema<T: BeaconChainTypes>(
             migrate_schema::<T>(
                 db.clone(),
                 deposit_contract_deploy_block,
-                datadir,
                 from,
                 next,
                 log.clone(),
                 spec,
             )?;
-            migrate_schema::<T>(
-                db,
-                deposit_contract_deploy_block,
-                datadir,
-                next,
-                to,
-                log,
-                spec,
-            )
+            migrate_schema::<T>(db, deposit_contract_deploy_block, next, to, log, spec)
         }
 
         //
diff --git a/beacon_node/beacon_chain/src/test_utils.rs b/beacon_node/beacon_chain/src/test_utils.rs
index 3b4a62f5a..a1c7acf17 100644
--- a/beacon_node/beacon_chain/src/test_utils.rs
+++ b/beacon_node/beacon_chain/src/test_utils.rs
@@ -356,7 +356,7 @@ where
 
         let urls: Vec<SensitiveUrl> = urls
             .iter()
-            .map(|s| SensitiveUrl::parse(*s))
+            .map(|s| SensitiveUrl::parse(s))
             .collect::<Result<_, _>>()
             .unwrap();
 
diff --git a/beacon_node/beacon_chain/src/validator_monitor.rs b/beacon_node/beacon_chain/src/validator_monitor.rs
index 06734d3e6..95f4aadce 100644
--- a/beacon_node/beacon_chain/src/validator_monitor.rs
+++ b/beacon_node/beacon_chain/src/validator_monitor.rs
@@ -332,34 +332,22 @@ impl<T: EthSpec> ValidatorMonitor<T> {
                     metrics::set_int_gauge(
                         &metrics::VALIDATOR_MONITOR_SLASHED,
                         &[id],
-                        if validator.slashed { 1 } else { 0 },
+                        i64::from(validator.slashed),
                     );
                     metrics::set_int_gauge(
                         &metrics::VALIDATOR_MONITOR_ACTIVE,
                         &[id],
-                        if validator.is_active_at(current_epoch) {
-                            1
-                        } else {
-                            0
-                        },
+                        i64::from(validator.is_active_at(current_epoch)),
                     );
                     metrics::set_int_gauge(
                         &metrics::VALIDATOR_MONITOR_EXITED,
                         &[id],
-                        if validator.is_exited_at(current_epoch) {
-                            1
-                        } else {
-                            0
-                        },
+                        i64::from(validator.is_exited_at(current_epoch)),
                     );
                     metrics::set_int_gauge(
                         &metrics::VALIDATOR_MONITOR_WITHDRAWABLE,
                         &[id],
-                        if validator.is_withdrawable_at(current_epoch) {
-                            1
-                        } else {
-                            0
-                        },
+                        i64::from(validator.is_withdrawable_at(current_epoch)),
                     );
                     metrics::set_int_gauge(
                         &metrics::VALIDATOR_ACTIVATION_ELIGIBILITY_EPOCH,
diff --git a/beacon_node/client/src/builder.rs b/beacon_node/client/src/builder.rs
index c89980e6e..36d6491a5 100644
--- a/beacon_node/client/src/builder.rs
+++ b/beacon_node/client/src/builder.rs
@@ -858,7 +858,6 @@ where
     /// Specifies that the `Client` should use a `HotColdDB` database.
     pub fn disk_store(
         mut self,
-        datadir: &Path,
         hot_path: &Path,
         cold_path: &Path,
         config: StoreConfig,
@@ -888,7 +887,6 @@ where
             migrate_schema::<Witness<TSlotClock, TEth1Backend, _, _, _>>(
                 db,
                 deposit_contract_deploy_block,
-                datadir,
                 from,
                 to,
                 log,
diff --git a/beacon_node/http_api/src/lib.rs b/beacon_node/http_api/src/lib.rs
index c25013fdd..a747430ee 100644
--- a/beacon_node/http_api/src/lib.rs
+++ b/beacon_node/http_api/src/lib.rs
@@ -1,3 +1,4 @@
+#![recursion_limit = "256"]
 //! This crate contains a HTTP server which serves the endpoints listed here:
 //!
 //! https://github.com/ethereum/beacon-APIs
diff --git a/beacon_node/lighthouse_network/src/service/utils.rs b/beacon_node/lighthouse_network/src/service/utils.rs
index 2aaa46fe8..8073ae776 100644
--- a/beacon_node/lighthouse_network/src/service/utils.rs
+++ b/beacon_node/lighthouse_network/src/service/utils.rs
@@ -269,7 +269,7 @@ pub(crate) fn save_metadata_to_disk<E: EthSpec>(
     metadata: MetaData<E>,
     log: &slog::Logger,
 ) {
-    let _ = std::fs::create_dir_all(&dir);
+    let _ = std::fs::create_dir_all(dir);
     match File::create(dir.join(METADATA_FILENAME))
         .and_then(|mut f| f.write_all(&metadata.as_ssz_bytes()))
     {
diff --git a/beacon_node/operation_pool/src/lib.rs b/beacon_node/operation_pool/src/lib.rs
index 8c335189c..4fe5a7254 100644
--- a/beacon_node/operation_pool/src/lib.rs
+++ b/beacon_node/operation_pool/src/lib.rs
@@ -267,7 +267,7 @@ impl<T: EthSpec> OperationPool<T> {
                 &prev_epoch_key,
                 &*all_attestations,
                 state,
-                &*reward_cache,
+                &reward_cache,
                 total_active_balance,
                 prev_epoch_validity_filter,
                 spec,
@@ -278,7 +278,7 @@ impl<T: EthSpec> OperationPool<T> {
                 &curr_epoch_key,
                 &*all_attestations,
                 state,
-                &*reward_cache,
+                &reward_cache,
                 total_active_balance,
                 curr_epoch_validity_filter,
                 spec,
diff --git a/beacon_node/src/lib.rs b/beacon_node/src/lib.rs
index 9fd688220..650763dca 100644
--- a/beacon_node/src/lib.rs
+++ b/beacon_node/src/lib.rs
@@ -61,7 +61,7 @@ impl<E: EthSpec> ProductionBeaconNode<E> {
         let client_genesis = client_config.genesis.clone();
         let store_config = client_config.store.clone();
         let log = context.log().clone();
-        let datadir = client_config.create_data_dir()?;
+        let _datadir = client_config.create_data_dir()?;
         let db_path = client_config.create_db_path()?;
         let freezer_db_path = client_config.create_freezer_db_path()?;
         let executor = context.executor.clone();
@@ -84,13 +84,7 @@ impl<E: EthSpec> ProductionBeaconNode<E> {
             .runtime_context(context)
             .chain_spec(spec)
             .http_api_config(client_config.http_api.clone())
-            .disk_store(
-                &datadir,
-                &db_path,
-                &freezer_db_path,
-                store_config,
-                log.clone(),
-            )?;
+            .disk_store(&db_path, &freezer_db_path, store_config, log.clone())?;
 
         let builder = if let Some(slasher_config) = client_config.slasher.clone() {
             let slasher = Arc::new(
diff --git a/common/filesystem/src/lib.rs b/common/filesystem/src/lib.rs
index 6305671c5..d73b7a355 100644
--- a/common/filesystem/src/lib.rs
+++ b/common/filesystem/src/lib.rs
@@ -55,7 +55,7 @@ pub enum Error {
 /// Creates a file with `600 (-rw-------)` permissions and writes the specified bytes to file.
 pub fn create_with_600_perms<P: AsRef<Path>>(path: P, bytes: &[u8]) -> Result<(), Error> {
     let path = path.as_ref();
-    let mut file = File::create(&path).map_err(Error::UnableToCreateFile)?;
+    let mut file = File::create(path).map_err(Error::UnableToCreateFile)?;
 
     #[cfg(unix)]
     {
diff --git a/consensus/serde_utils/src/hex_vec.rs b/consensus/serde_utils/src/hex_vec.rs
index 60d649443..f7f483362 100644
--- a/consensus/serde_utils/src/hex_vec.rs
+++ b/consensus/serde_utils/src/hex_vec.rs
@@ -10,7 +10,7 @@ where
     S: Serializer,
 {
     let mut hex_string: String = "0x".to_string();
-    hex_string.push_str(&hex::encode(&bytes));
+    hex_string.push_str(&hex::encode(bytes));
 
     serializer.serialize_str(&hex_string)
 }
diff --git a/consensus/serde_utils/src/u64_hex_be.rs b/consensus/serde_utils/src/u64_hex_be.rs
index dc6af0fa4..6af8a7589 100644
--- a/consensus/serde_utils/src/u64_hex_be.rs
+++ b/consensus/serde_utils/src/u64_hex_be.rs
@@ -39,7 +39,7 @@ impl<'de> Visitor<'de> for QuantityVisitor {
             hex::decode(&format!("0{}", stripped))
                 .map_err(|e| de::Error::custom(format!("invalid hex ({:?})", e)))
         } else {
-            hex::decode(&stripped).map_err(|e| de::Error::custom(format!("invalid hex ({:?})", e)))
+            hex::decode(stripped).map_err(|e| de::Error::custom(format!("invalid hex ({:?})", e)))
         }
     }
 }
diff --git a/consensus/tree_hash/src/merkle_hasher.rs b/consensus/tree_hash/src/merkle_hasher.rs
index 1753eade1..2acaf1c3b 100644
--- a/consensus/tree_hash/src/merkle_hasher.rs
+++ b/consensus/tree_hash/src/merkle_hasher.rs
@@ -368,7 +368,7 @@ mod test {
     fn context_size() {
         assert_eq!(
             mem::size_of::<HalfNode>(),
-            232,
+            224,
             "Halfnode size should be as expected"
         );
     }
diff --git a/consensus/types/src/config_and_preset.rs b/consensus/types/src/config_and_preset.rs
index 74b07717a..f72b1710d 100644
--- a/consensus/types/src/config_and_preset.rs
+++ b/consensus/types/src/config_and_preset.rs
@@ -40,7 +40,7 @@ impl ConfigAndPreset {
         let extra_fields = get_extra_fields(spec);
 
         if spec.bellatrix_fork_epoch.is_some()
-            || fork_name == None
+            || fork_name.is_none()
             || fork_name == Some(ForkName::Merge)
         {
             let bellatrix_preset = BellatrixPreset::from_chain_spec::<T>(spec);
@@ -65,7 +65,7 @@ impl ConfigAndPreset {
 
 /// Get a hashmap of constants to add to the `PresetAndConfig`
 pub fn get_extra_fields(spec: &ChainSpec) -> HashMap<String, Value> {
-    let hex_string = |value: &[u8]| format!("0x{}", hex::encode(&value)).into();
+    let hex_string = |value: &[u8]| format!("0x{}", hex::encode(value)).into();
     let u32_hex = |v: u32| hex_string(&v.to_le_bytes());
     let u8_hex = |v: u8| hex_string(&v.to_le_bytes());
     hashmap! {
diff --git a/consensus/types/src/graffiti.rs b/consensus/types/src/graffiti.rs
index 73beb8264..2b0a645cd 100644
--- a/consensus/types/src/graffiti.rs
+++ b/consensus/types/src/graffiti.rs
@@ -27,7 +27,7 @@ impl Graffiti {
 
 impl fmt::Display for Graffiti {
     fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
-        write!(f, "{}", eth2_serde_utils::hex::encode(&self.0))
+        write!(f, "{}", eth2_serde_utils::hex::encode(self.0))
     }
 }
 
diff --git a/database_manager/src/lib.rs b/database_manager/src/lib.rs
index cb50a4ee8..c0023f350 100644
--- a/database_manager/src/lib.rs
+++ b/database_manager/src/lib.rs
@@ -257,7 +257,6 @@ pub fn migrate_db<E: EthSpec>(
     migrate_schema::<Witness<SystemTimeSlotClock, CachingEth1Backend<E>, _, _, _>>(
         db,
         client_config.eth1.deposit_contract_deploy_block,
-        &client_config.get_data_dir(),
         from,
         to,
         log,
diff --git a/slasher/src/array.rs b/slasher/src/array.rs
index d9cb8a4ec..4deb38912 100644
--- a/slasher/src/array.rs
+++ b/slasher/src/array.rs
@@ -188,7 +188,7 @@ pub trait TargetArrayChunk: Sized + serde::Serialize + serde::de::DeserializeOwn
 
         txn.put(
             Self::select_db(db),
-            &disk_key.to_be_bytes(),
+            disk_key.to_be_bytes(),
             &compressed_value,
         )?;
         Ok(())
diff --git a/slasher/src/database.rs b/slasher/src/database.rs
index c8046c80d..49d2b00a4 100644
--- a/slasher/src/database.rs
+++ b/slasher/src/database.rs
@@ -301,7 +301,7 @@ impl<E: EthSpec> SlasherDB<E> {
     pub fn store_schema_version(&self, txn: &mut RwTransaction<'_>) -> Result<(), Error> {
         txn.put(
             &self.databases.metadata_db,
-            &METADATA_VERSION_KEY,
+            METADATA_VERSION_KEY,
             &bincode::serialize(&CURRENT_SCHEMA_VERSION)?,
         )?;
         Ok(())
@@ -323,7 +323,7 @@ impl<E: EthSpec> SlasherDB<E> {
     pub fn store_config(&self, config: &Config, txn: &mut RwTransaction<'_>) -> Result<(), Error> {
         txn.put(
             &self.databases.metadata_db,
-            &METADATA_CONFIG_KEY,
+            METADATA_CONFIG_KEY,
             &bincode::serialize(config)?,
         )?;
         Ok(())
@@ -367,7 +367,7 @@ impl<E: EthSpec> SlasherDB<E> {
                 txn.put(
                     &self.databases.attesters_db,
                     &AttesterKey::new(validator_index, target_epoch, &self.config),
-                    &CompactAttesterRecord::null().as_bytes(),
+                    CompactAttesterRecord::null().as_bytes(),
                 )?;
             }
         }
@@ -423,7 +423,7 @@ impl<E: EthSpec> SlasherDB<E> {
         key: &IndexedAttestationIdKey,
         value: IndexedAttestationId,
     ) -> Result<(), Error> {
-        txn.put(&self.databases.indexed_attestation_id_db, key, &value)?;
+        txn.put(&self.databases.indexed_attestation_id_db, key, value)?;
         Ok(())
     }
 
@@ -579,7 +579,7 @@ impl<E: EthSpec> SlasherDB<E> {
             txn.put(
                 &self.databases.attesters_db,
                 &AttesterKey::new(validator_index, target_epoch, &self.config),
-                &indexed_attestation_id,
+                indexed_attestation_id,
             )?;
 
             Ok(AttesterSlashingStatus::NotSlashable)
diff --git a/testing/execution_engine_integration/src/geth.rs b/testing/execution_engine_integration/src/geth.rs
index 467fd8b43..1b96fa9f3 100644
--- a/testing/execution_engine_integration/src/geth.rs
+++ b/testing/execution_engine_integration/src/geth.rs
@@ -13,7 +13,7 @@ const GETH_REPO_URL: &str = "https://github.com/ethereum/go-ethereum";
 pub fn build_result(repo_dir: &Path) -> Output {
     Command::new("make")
         .arg("geth")
-        .current_dir(&repo_dir)
+        .current_dir(repo_dir)
         .output()
         .expect("failed to make geth")
 }
diff --git a/testing/execution_engine_integration/src/test_rig.rs b/testing/execution_engine_integration/src/test_rig.rs
index bd179be53..b3464ec98 100644
--- a/testing/execution_engine_integration/src/test_rig.rs
+++ b/testing/execution_engine_integration/src/test_rig.rs
@@ -203,8 +203,8 @@ impl<E: GenericExecutionEngine> TestRig<E> {
         .await;
 
         // We hardcode the accounts here since some EEs start with a default unlocked account
-        let account1 = ethers_core::types::Address::from_slice(&hex::decode(&ACCOUNT1).unwrap());
-        let account2 = ethers_core::types::Address::from_slice(&hex::decode(&ACCOUNT2).unwrap());
+        let account1 = ethers_core::types::Address::from_slice(&hex::decode(ACCOUNT1).unwrap());
+        let account2 = ethers_core::types::Address::from_slice(&hex::decode(ACCOUNT2).unwrap());
 
         /*
          * Check the transition config endpoint.
diff --git a/testing/execution_engine_integration/src/transactions.rs b/testing/execution_engine_integration/src/transactions.rs
index a8c0ab3c1..62b77d502 100644
--- a/testing/execution_engine_integration/src/transactions.rs
+++ b/testing/execution_engine_integration/src/transactions.rs
@@ -30,7 +30,7 @@ pub fn transactions<E: EthSpec>(account1: Address, account2: Address) -> Vec<Typ
         Transaction::DepositDepositContract {
             sender: account1,
             deposit_contract_address: ethers_core::types::Address::from_slice(
-                &hex::decode(&DEPOSIT_CONTRACT_ADDRESS).unwrap(),
+                &hex::decode(DEPOSIT_CONTRACT_ADDRESS).unwrap(),
             ),
         }
         .transaction::<E>(),
diff --git a/validator_client/src/http_api/api_secret.rs b/validator_client/src/http_api/api_secret.rs
index 484ac50bd..b42cd11ed 100644
--- a/validator_client/src/http_api/api_secret.rs
+++ b/validator_client/src/http_api/api_secret.rs
@@ -60,7 +60,7 @@ impl ApiSecret {
             // Create and write the secret key to file with appropriate permissions
             create_with_600_perms(
                 &sk_path,
-                eth2_serde_utils::hex::encode(&sk.serialize()).as_bytes(),
+                eth2_serde_utils::hex::encode(sk.serialize()).as_bytes(),
             )
             .map_err(|e| {
                 format!(