diff --git a/lib/utils.ak b/lib/utils.ak
index 1d65565..ebf8bf6 100644
--- a/lib/utils.ak
+++ b/lib/utils.ak
@@ -1,6 +1,6 @@
 use aiken/hash.{Blake2b_224, Hash}
 use aiken/list.{filter}
-use aiken/transaction.{Input, Output, ScriptContext, Spend, find_input} as tx
+use aiken/transaction.{Input, Output, ScriptContext, Spend, find_input}
 use aiken/transaction/credential.{VerificationKey}
 
 pub type POSIXTime =
@@ -25,14 +25,8 @@ pub fn find_own_input(ctx: ScriptContext) -> Option<Input> {
   }
 }
 
-// getContinuingOutputs :: ScriptContext -> [TxOut]
-// getContinuingOutputs ctx | Just TxInInfo{txInInfoResolved=TxOut{txOutAddress}} <- findOwnInput ctx = filter (f txOutAddress) (txInfoOutputs $ scriptContextTxInfo ctx)
-//     where
-//         f addr TxOut{txOutAddress=otherAddress} = addr == otherAddress
-// getContinuingOutputs _ = traceError "Lf" -- "Can't get any continuing outputs"
-
 pub fn get_continuing_outputs(ctx: ScriptContext) -> List<Output> {
   expect Some(input) = find_own_input(ctx)
   let script_address = input.output.address
-  filter(ctx.transaction.outputs, fn(o) { o.address == script_address })
+  filter(ctx.transaction.outputs, fn(o: Output) { o.address == script_address })
 }
diff --git a/validators/samples/minting.ak b/validators/samples/minting.ak
index 9b9fd32..8704130 100644
--- a/validators/samples/minting.ak
+++ b/validators/samples/minting.ak
@@ -1,5 +1,5 @@
 use aiken/dict as dict
-use aiken/list as list
+use aiken/list.{any} as list
 use aiken/transaction.{Input, OutputReference, ScriptContext, Transaction} as tx
 use aiken/transaction/value.{AssetName, MintedValue, PolicyId}
 
@@ -29,7 +29,7 @@ validator(token_name: ByteArray, oref: OutputReference) {
 }
 
 fn has_utxo(oref: OutputReference, inputs: List<Input>) {
-  list.any(inputs, fn(input) { input.output_reference == oref })
+  any(inputs, fn(input) { input.output_reference == oref })
 }
 
 fn check_mint(cs: PolicyId, tn: AssetName, mint: MintedValue, mint_qty: Int) {
diff --git a/validators/samples/typed.ak b/validators/samples/typed.ak
index 7d41db6..64be8af 100644
--- a/validators/samples/typed.ak
+++ b/validators/samples/typed.ak
@@ -1,5 +1,4 @@
 use aiken/transaction.{ScriptContext}
-use utils.{trace_if_false}
 
 validator {
   fn simple_typed(_datum: Void, redeemer: Int, _ctx: ScriptContext) -> Bool {
diff --git a/validators/samples/vesting.ak b/validators/samples/vesting.ak
index 9c07361..afa7e36 100644
--- a/validators/samples/vesting.ak
+++ b/validators/samples/vesting.ak
@@ -1,7 +1,7 @@
 use aiken/interval.{Finite}
 use aiken/list
 use aiken/transaction.{ScriptContext, Transaction, ValidityRange}
-use utils.{POSIXTime, PubKeyHash, trace_if_false}
+use utils.{POSIXTime, PubKeyHash}
 
 type VestingDatum {
   beneficiary: PubKeyHash,
@@ -33,13 +33,13 @@ fn must_start_after(range: ValidityRange, maturity: POSIXTime) {
 
 validator(beneficiary: PubKeyHash) {
   fn param_vesting(
-    datum: POSIXTime,
+    maturity: POSIXTime,
     _redeemer: Void,
     ctx: ScriptContext,
   ) -> Bool {
-    must_be_signed_by(ctx.transaction, datum.beneficiary)? && must_start_after(
+    must_be_signed_by(ctx.transaction, beneficiary)? && must_start_after(
       ctx.transaction.validity_range,
-      datum.maturity,
+      maturity,
     )?
   }
 }