diff --git a/beacon_node/beacon_chain/src/beacon_chain.rs b/beacon_node/beacon_chain/src/beacon_chain.rs
index 38b32ad2c2..ad05b155c4 100644
--- a/beacon_node/beacon_chain/src/beacon_chain.rs
+++ b/beacon_node/beacon_chain/src/beacon_chain.rs
@@ -933,7 +933,7 @@ impl<T: BeaconChainTypes> BeaconChain<T> {
                         self.log,
                         "Beacon block imported";
                         "block_root" => format!("{:?}", block_root),
-                        "block_slot" => format!("{:?}", block_root),
+                        "block_slot" => format!("{:?}", block.slot.as_u64()),
                     );
                     let _ = self.event_handler.register(EventKind::BeaconBlockImported {
                         block_root: *block_root,
diff --git a/book/src/simple-testnet.md b/book/src/simple-testnet.md
index 9b062badeb..40c7b1e90d 100644
--- a/book/src/simple-testnet.md
+++ b/book/src/simple-testnet.md
@@ -35,7 +35,7 @@ $ lighthouse bn testnet -f recent 8
 In a new terminal window, start the validator client with:
 
 ```bash
-$ lighthouse bn testnet -b insecure 0 8
+$ lighthouse vc testnet -b insecure 0 8
 ```
 
 > Notes:
diff --git a/eth2/types/src/test_utils/builders/testing_attestation_data_builder.rs b/eth2/types/src/test_utils/builders/testing_attestation_data_builder.rs
index f5abb46150..7be93fd472 100644
--- a/eth2/types/src/test_utils/builders/testing_attestation_data_builder.rs
+++ b/eth2/types/src/test_utils/builders/testing_attestation_data_builder.rs
@@ -14,7 +14,7 @@ impl TestingAttestationDataBuilder {
     pub fn new<T: EthSpec>(
         test_task: AttestationTestTask,
         state: &BeaconState<T>,
-        mut index: u64,
+        index: u64,
         mut slot: Slot,
         spec: &ChainSpec,
     ) -> Self {