diff --git a/jsonrpc/block.go b/jsonrpc/block.go
index b466b59..3a97338 100644
--- a/jsonrpc/block.go
+++ b/jsonrpc/block.go
@@ -42,7 +42,7 @@ func (s *Service) blockAtHash(ctx context.Context, hash string) (*spec.Block, er
 	var block spec.Block
 
 	if err := s.client.CallFor(&block, "eth_getBlockByHash", hash, true); err != nil {
-		return nil, err
+		return nil, errors.Wrap(err, fmt.Sprintf("eth_getBlockByHash for %#x failed", hash))
 	}
 
 	return &block, nil
@@ -53,11 +53,11 @@ func (s *Service) blockAtHeight(ctx context.Context, height int64) (*spec.Block,
 
 	if height == -1 {
 		if err := s.client.CallFor(&block, "eth_getBlockByNumber", "latest", true); err != nil {
-			return nil, err
+			return nil, errors.Wrap(err, "eth_getBlockByNumber for latest failed")
 		}
 	} else {
 		if err := s.client.CallFor(&block, "eth_getBlockByNumber", fmt.Sprintf("0x%x", height), true); err != nil {
-			return nil, err
+			return nil, errors.Wrap(err, fmt.Sprintf("eth_getBlockByNumber for 0x%x failed", height))
 		}
 	}
 
diff --git a/jsonrpc/service.go b/jsonrpc/service.go
index 4bd0662..176a772 100644
--- a/jsonrpc/service.go
+++ b/jsonrpc/service.go
@@ -123,10 +123,6 @@ func New(ctx context.Context, params ...Parameter) (execclient.Service, error) {
 // fetchStaticValues fetches values that never change.
 // This caches the values, avoiding future API calls.
 func (s *Service) fetchStaticValues(ctx context.Context) error {
-	if _, err := s.NetworkID(ctx); err != nil {
-		return errors.Wrap(err, "failed to fetch network ID")
-	}
-
 	return nil
 }
 
diff --git a/spec/type0transaction.go b/spec/type0transaction.go
index 76e1327..37279be 100644
--- a/spec/type0transaction.go
+++ b/spec/type0transaction.go
@@ -168,7 +168,7 @@ func (t *Type0Transaction) unpack(data *type0TransactionJSON) error {
 	}
 	t.GasPrice, err = strconv.ParseUint(util.PreUnmarshalHexString(data.GasPrice), 16, 64)
 	if err != nil {
-		return errors.Wrap(err, "gas price invalid")
+		return errors.Wrap(err, fmt.Sprintf("gas price for %s invalid", data.Hash))
 	}
 
 	if data.Hash == "" {