diff --git a/djangorestframework/authentication.py b/djangorestframework/authentication.py
index 656c58e4b..48f898dd5 100644
--- a/djangorestframework/authentication.py
+++ b/djangorestframework/authentication.py
@@ -79,9 +79,9 @@ class BasicAuthentication(BaseAuthentication):
                     return None
 
                 try:
-                    username = encoding.smart_unicode(auth_parts[0])
-                    password = encoding.smart_unicode(auth_parts[2])
-                except encoding.DjangoUnicodeDecodeError:
+                    username = smart_unicode(auth_parts[0])
+                    password = smart_unicode(auth_parts[2])
+                except DjangoUnicodeDecodeError:
                     return None
 
                 user = authenticate(username=username, password=password)
diff --git a/djangorestframework/resources.py b/djangorestframework/resources.py
index 30d75eef9..66ab0a855 100644
--- a/djangorestframework/resources.py
+++ b/djangorestframework/resources.py
@@ -126,8 +126,6 @@ class FormResource(Resource):
         data = data and data or {}
         files = files and files or {}
 
-        # In addition to regular validation we also ensure no additional fields
-        # are being passed in...
         seen_fields_set = set(data.keys())
         form_fields_set = set(bound_form.fields.keys())
         allowed_extra_fields_set = set(allowed_extra_fields)
@@ -142,7 +140,7 @@ class FormResource(Resource):
             cleaned_data = bound_form.cleaned_data
 
             # Add in any extra fields to the cleaned content...
-            for key in (allowed_extra_fields & seen_fields) - set(cleaned_data.keys()):
+            for key in (allowed_extra_fields_set & seen_fields_set) - set(cleaned_data.keys()):
                 cleaned_data[key] = data[key]
 
             return cleaned_data
diff --git a/djangorestframework/tests/renderers.py b/djangorestframework/tests/renderers.py
index b683e27d3..c3dfb98b6 100644
--- a/djangorestframework/tests/renderers.py
+++ b/djangorestframework/tests/renderers.py
@@ -157,7 +157,7 @@ class RendererIntegrationTests(TestCase):
 
 _flat_repr = '{"foo": ["bar", "baz"]}'
 
-_indented_repr = '{\n  "foo": [\n    "bar", \n    "baz"\n  ]\n}'
+_indented_repr = '{\n    "foo": [\n        "bar",\n        "baz"\n    ]\n}'
 
 
 class JSONRendererTests(TestCase):