diff --git a/confidential/proof-extraction/src/errors.rs b/confidential/proof-extraction/src/errors.rs
index e710dec71..45a8a4ec8 100644
--- a/confidential/proof-extraction/src/errors.rs
+++ b/confidential/proof-extraction/src/errors.rs
@@ -14,4 +14,6 @@ pub enum TokenProofExtractionError {
     CurveArithmetic,
     #[error("Ciphertext extraction failed")]
     CiphertextExtraction,
+    #[error("Delta commitment mismatch")]
+    DeltaCommitmentMismatch,
 }
diff --git a/confidential/proof-extraction/src/transfer_with_fee.rs b/confidential/proof-extraction/src/transfer_with_fee.rs
index 72b423848..c6150c87d 100644
--- a/confidential/proof-extraction/src/transfer_with_fee.rs
+++ b/confidential/proof-extraction/src/transfer_with_fee.rs
@@ -336,7 +336,7 @@ fn verify_delta_commitment(
 
     let proof_delta_commitment_point = commitment_to_ristretto(proof_delta_commitment);
     if expected_delta_commitment_point != proof_delta_commitment_point {
-        return Err(TokenProofExtractionError::CurveArithmetic);
+        return Err(TokenProofExtractionError::DeltaCommitmentMismatch);
     }
     Ok(())
 }
diff --git a/program/src/extension/confidential_transfer/processor.rs b/program/src/extension/confidential_transfer/processor.rs
index 383b3f030..01adac301 100644
--- a/program/src/extension/confidential_transfer/processor.rs
+++ b/program/src/extension/confidential_transfer/processor.rs
@@ -724,7 +724,7 @@ fn process_transfer(
 
         let fee_sigma_proof_instruction_offset =
             fee_sigma_proof_instruction_offset.ok_or(ProgramError::InvalidInstructionData)?;
-        let fee_ciphertext_validity_proof_insruction_offset =
+        let fee_ciphertext_validity_proof_instruction_offset =
             fee_ciphertext_validity_proof_instruction_offset
                 .ok_or(ProgramError::InvalidInstructionData)?;
 
@@ -739,7 +739,7 @@ fn process_transfer(
             equality_proof_instruction_offset,
             transfer_amount_ciphertext_validity_proof_instruction_offset,
             fee_sigma_proof_instruction_offset,
-            fee_ciphertext_validity_proof_insruction_offset,
+            fee_ciphertext_validity_proof_instruction_offset,
             range_proof_instruction_offset,
             fee_parameters,
         )?;