diff --git a/python_modules/dagster-graphql/dagster_graphql/cli.py b/python_modules/dagster-graphql/dagster_graphql/cli.py
index 9eb43bedce417..3f0bd4508c38c 100644
--- a/python_modules/dagster-graphql/dagster_graphql/cli.py
+++ b/python_modules/dagster-graphql/dagster_graphql/cli.py
@@ -57,10 +57,11 @@ def execute_query(
     if "errors" in result_dict:
         result_dict_errors = check.list_elem(result_dict, "errors", of_type=Exception)
         result_errors = check.is_list(result.errors, of_type=Exception)
-        check.invariant(len(result_dict_errors) == len(result_errors))  #
+        check.invariant(len(result_dict_errors) == len(result_errors))
         for python_error, error_dict in zip(result_errors, result_dict_errors):
-            if hasattr(python_error, "original_error") and python_error.original_error:
-                error_dict["stack_trace"] = get_stack_trace_array(python_error.original_error)
+            # Typing errors caught by making is_list typed -- schrockn 2024-06-09
+            if hasattr(python_error, "original_error") and python_error.original_error:  # type: ignore
+                error_dict["stack_trace"] = get_stack_trace_array(python_error.original_error)  # type: ignore
 
     return result_dict
 
diff --git a/python_modules/dagster/dagster/_check/__init__.py b/python_modules/dagster/dagster/_check/__init__.py
index d1e40b8876099..54b6f6ce6ce85 100644
--- a/python_modules/dagster/dagster/_check/__init__.py
+++ b/python_modules/dagster/dagster/_check/__init__.py
@@ -878,18 +878,21 @@ def opt_list_elem(
     return _check_iterable_items(value, of_type, "list")
 
 
+TTypeOrTupleOfTTypes = Union[Type[T], Tuple[Type[T], ...]]
+
+
 def is_list(
     obj: object,
-    of_type: Optional[TypeOrTupleOfTypes] = None,
+    of_type: Optional[TTypeOrTupleOfTTypes[T]] = None,
     additional_message: Optional[str] = None,
-) -> List:
+) -> List[T]:
     if not isinstance(obj, list):
         raise _type_mismatch_error(obj, list, additional_message)
 
     if not of_type:
         return obj
 
-    return _check_iterable_items(obj, of_type, "list")
+    return list(_check_iterable_items(obj, of_type, "list"))
 
 
 # ########################
diff --git a/python_modules/dagster/dagster/_config/snap.py b/python_modules/dagster/dagster/_config/snap.py
index 36fb20ad72c9f..48a622c2a0494 100644
--- a/python_modules/dagster/dagster/_config/snap.py
+++ b/python_modules/dagster/dagster/_config/snap.py
@@ -180,7 +180,8 @@ def has_field(self, name: str) -> bool:
     @property
     def field_names(self) -> Sequence[str]:
         fields = check.is_list(self.fields, of_type=ConfigFieldSnap)
-        return [fs.name for fs in fields]
+        # Typing error caught by making is_list typed -- schrockn 2024-06-09
+        return [fs.name for fs in fields]  # type: ignore
 
     def get_child_type_keys(self) -> Sequence[str]:
         if ConfigTypeKind.is_closed_generic(self.kind):