diff --git a/zcash_client_backend/CHANGELOG.md b/zcash_client_backend/CHANGELOG.md
index f3968e1d9..dd9676ab6 100644
--- a/zcash_client_backend/CHANGELOG.md
+++ b/zcash_client_backend/CHANGELOG.md
@@ -6,6 +6,10 @@ and this library adheres to Rust's notion of
 [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
 ## [Unreleased]
+### Added
+- `impl Eq for zcash_client_backend::address::RecipientAddress`
+- `impl Eq for zcash_client_backend::zip321::{Payment, TransactionRequest}`
+
 ### Changed
 - MSRV is now 1.65.0.
 - Bumped dependencies to `hdwallet 0.4`.
diff --git a/zcash_client_backend/src/address.rs b/zcash_client_backend/src/address.rs
index a5f4a36d6..87e1ac0fe 100644
--- a/zcash_client_backend/src/address.rs
+++ b/zcash_client_backend/src/address.rs
@@ -174,7 +174,7 @@ impl UnifiedAddress {
 
 /// An address that funds can be sent to.
 // TODO: rename to ParsedAddress
-#[derive(Debug, PartialEq, Clone)]
+#[derive(Debug, PartialEq, Eq, Clone)]
 pub enum RecipientAddress {
     Shielded(PaymentAddress),
     Transparent(TransparentAddress),
diff --git a/zcash_client_backend/src/data_api/wallet/input_selection.rs b/zcash_client_backend/src/data_api/wallet/input_selection.rs
index f5d4528ae..f9ea49c68 100644
--- a/zcash_client_backend/src/data_api/wallet/input_selection.rs
+++ b/zcash_client_backend/src/data_api/wallet/input_selection.rs
@@ -434,10 +434,7 @@ where
             Ok(balance) => balance,
             Err(ChangeError::DustInputs { transparent, .. }) => {
                 let exclusions: BTreeSet<OutPoint> = transparent.into_iter().collect();
-                transparent_inputs = transparent_inputs
-                    .into_iter()
-                    .filter(|i| !exclusions.contains(i.outpoint()))
-                    .collect();
+                transparent_inputs.retain(|i| !exclusions.contains(i.outpoint()));
 
                 self.change_strategy.compute_balance(
                     params,
diff --git a/zcash_client_backend/src/zip321.rs b/zcash_client_backend/src/zip321.rs
index 46f979d80..271632846 100644
--- a/zcash_client_backend/src/zip321.rs
+++ b/zcash_client_backend/src/zip321.rs
@@ -53,7 +53,7 @@ pub fn memo_from_base64(s: &str) -> Result<MemoBytes, Zip321Error> {
 }
 
 /// A single payment being requested.
-#[derive(Debug, PartialEq)]
+#[derive(Debug, PartialEq, Eq)]
 pub struct Payment {
     /// The payment address to which the payment should be sent.
     pub recipient_address: RecipientAddress,
@@ -111,7 +111,7 @@ impl Payment {
 /// When constructing a transaction in response to such a request,
 /// a separate output should be added to the transaction for each
 /// payment value in the request.
-#[derive(Debug, PartialEq)]
+#[derive(Debug, PartialEq, Eq)]
 pub struct TransactionRequest {
     payments: Vec<Payment>,
 }
@@ -402,7 +402,7 @@ mod parse {
 
     /// A data type that defines the possible parameter types which may occur within a
     /// ZIP 321 URI.
-    #[derive(Debug, PartialEq)]
+    #[derive(Debug, PartialEq, Eq)]
     pub enum Param {
         Addr(Box<RecipientAddress>),
         Amount(Amount),
diff --git a/zcash_primitives/src/block.rs b/zcash_primitives/src/block.rs
index 31c12234e..6271e0535 100644
--- a/zcash_primitives/src/block.rs
+++ b/zcash_primitives/src/block.rs
@@ -88,7 +88,7 @@ impl BlockHeader {
         header
             .hash
             .0
-            .copy_from_slice(&Sha256::digest(&Sha256::digest(&raw)));
+            .copy_from_slice(&Sha256::digest(Sha256::digest(&raw)));
         Ok(header)
     }
 
diff --git a/zcash_primitives/src/legacy/keys.rs b/zcash_primitives/src/legacy/keys.rs
index 6423b1fda..fead35a81 100644
--- a/zcash_primitives/src/legacy/keys.rs
+++ b/zcash_primitives/src/legacy/keys.rs
@@ -152,7 +152,7 @@ impl AccountPubKey {
 #[deprecated(note = "This function will be removed from the public API in an upcoming refactor.")]
 pub fn pubkey_to_address(pubkey: &secp256k1::PublicKey) -> TransparentAddress {
     TransparentAddress::PublicKey(
-        *ripemd::Ripemd160::digest(Sha256::digest(&pubkey.serialize())).as_ref(),
+        *ripemd::Ripemd160::digest(Sha256::digest(pubkey.serialize())).as_ref(),
     )
 }
 
diff --git a/zcash_primitives/src/transaction/components/transparent/builder.rs b/zcash_primitives/src/transaction/components/transparent/builder.rs
index 3a2e20b6a..a65645fc9 100644
--- a/zcash_primitives/src/transaction/components/transparent/builder.rs
+++ b/zcash_primitives/src/transaction/components/transparent/builder.rs
@@ -146,7 +146,7 @@ impl TransparentBuilder {
                 use ripemd::Ripemd160;
                 use sha2::Sha256;
 
-                if hash[..] != Ripemd160::digest(Sha256::digest(&pubkey))[..] {
+                if hash[..] != Ripemd160::digest(Sha256::digest(pubkey))[..] {
                     return Err(Error::InvalidAddress);
                 }
             }
diff --git a/zcash_primitives/src/transaction/util/sha256d.rs b/zcash_primitives/src/transaction/util/sha256d.rs
index 889b2ba73..439bab9fd 100644
--- a/zcash_primitives/src/transaction/util/sha256d.rs
+++ b/zcash_primitives/src/transaction/util/sha256d.rs
@@ -22,7 +22,7 @@ impl<R: Read> HashReader<R> {
 
     /// Destroy this reader and return the hash of what was read.
     pub fn into_hash(self) -> Output<Sha256> {
-        Sha256::digest(&self.hasher.finalize())
+        Sha256::digest(self.hasher.finalize())
     }
 }
 
@@ -54,7 +54,7 @@ impl Default for HashWriter {
 impl HashWriter {
     /// Destroy this writer and return the hash of what was written.
     pub fn into_hash(self) -> Output<Sha256> {
-        Sha256::digest(&self.hasher.finalize())
+        Sha256::digest(self.hasher.finalize())
     }
 }