diff --git a/beacon_node/beacon_chain/src/test_utils.rs b/beacon_node/beacon_chain/src/test_utils.rs
index 3651512b85a..54fa6b5ff09 100644
--- a/beacon_node/beacon_chain/src/test_utils.rs
+++ b/beacon_node/beacon_chain/src/test_utils.rs
@@ -2923,7 +2923,6 @@ where
         let chain_dump = self.chain.chain_dump().unwrap();
         chain_dump
             .iter()
-            .cloned()
             .map(|checkpoint| checkpoint.beacon_state.finalized_checkpoint().root)
             .filter(|block_hash| *block_hash != Hash256::zero())
             .map(|hash| hash.into())
diff --git a/beacon_node/beacon_chain/tests/store_tests.rs b/beacon_node/beacon_chain/tests/store_tests.rs
index c1c53c014c1..8de96adb2d4 100644
--- a/beacon_node/beacon_chain/tests/store_tests.rs
+++ b/beacon_node/beacon_chain/tests/store_tests.rs
@@ -5528,7 +5528,6 @@ fn get_finalized_epoch_boundary_blocks(
     dump: &[BeaconSnapshot<MinimalEthSpec, BlindedPayload<MinimalEthSpec>>],
 ) -> HashSet<SignedBeaconBlockHash> {
     dump.iter()
-        .cloned()
         .map(|checkpoint| checkpoint.beacon_state.finalized_checkpoint().root.into())
         .collect()
 }
@@ -5537,7 +5536,6 @@ fn get_blocks(
     dump: &[BeaconSnapshot<MinimalEthSpec, BlindedPayload<MinimalEthSpec>>],
 ) -> HashSet<SignedBeaconBlockHash> {
     dump.iter()
-        .cloned()
         .map(|checkpoint| checkpoint.beacon_block_root.into())
         .collect()
 }
diff --git a/beacon_node/execution_layer/src/engine_api.rs b/beacon_node/execution_layer/src/engine_api.rs
index f285640b21c..b0cc4dd8241 100644
--- a/beacon_node/execution_layer/src/engine_api.rs
+++ b/beacon_node/execution_layer/src/engine_api.rs
@@ -770,7 +770,7 @@ impl ClientVersionV1 {
             self.commit
                 .0
                 .get(..4)
-                .map_or_else(|| self.commit.0.as_str(), |s| s)
+                .unwrap_or(self.commit.0.as_str())
                 .to_lowercase(),
             lighthouse_commit_prefix
                 .0
diff --git a/consensus/types/src/fork/fork_context.rs b/consensus/types/src/fork/fork_context.rs
index aec72761241..89f69bcbb62 100644
--- a/consensus/types/src/fork/fork_context.rs
+++ b/consensus/types/src/fork/fork_context.rs
@@ -63,8 +63,7 @@ impl ForkContext {
         let current_epoch = current_slot.epoch(E::slots_per_epoch());
         let current_fork = epoch_to_forks
             .values()
-            .filter(|&fork| fork.fork_epoch <= current_epoch)
-            .next_back()
+            .rfind(|&fork| fork.fork_epoch <= current_epoch)
             .cloned()
             .expect("should match at least genesis epoch");
 
diff --git a/lcli/src/http_sync.rs b/lcli/src/http_sync.rs
index dd941cda74e..6a0eb2a0e1d 100644
--- a/lcli/src/http_sync.rs
+++ b/lcli/src/http_sync.rs
@@ -132,7 +132,6 @@ async fn get_block_from_source<T: EthSpec>(
 
         let (kzg_proofs, blobs): (Vec<_>, Vec<_>) = blobs_from_source
             .iter()
-            .cloned()
             .map(|sidecar| (sidecar.kzg_proof, sidecar.blob.clone()))
             .unzip();