diff --git a/rest_framework/compat.py b/rest_framework/compat.py
index 971dee9cf..17814136b 100644
--- a/rest_framework/compat.py
+++ b/rest_framework/compat.py
@@ -33,6 +33,14 @@ def unicode_to_repr(value):
     return value
 
 
+def total_seconds(timedelta):
+    # TimeDelta.total_seconds() is only available in Python 2.7
+    if hasattr(timedelta, 'total_seconds'):
+        return timedelta.total_seconds()
+    else:
+        return (timedelta.days * 86400.0) + float(timedelta.seconds) + (timedelta.microseconds / 1000000.0)
+
+
 # OrderedDict only available in Python 2.7.
 # This will always be the case in Django 1.7 and above, as these versions
 # no longer support Python 2.6.
diff --git a/rest_framework/renderers.py b/rest_framework/renderers.py
index 634338e9e..ba6c9cc15 100644
--- a/rest_framework/renderers.py
+++ b/rest_framework/renderers.py
@@ -46,7 +46,7 @@ class BaseRenderer(object):
     render_style = 'text'
 
     def render(self, data, accepted_media_type=None, renderer_context=None):
-        raise NotImplemented('Renderer class requires .render() to be implemented')
+        raise NotImplementedError('Renderer class requires .render() to be implemented')
 
 
 class JSONRenderer(BaseRenderer):
diff --git a/rest_framework/routers.py b/rest_framework/routers.py
index 61f3ccab0..827da0340 100644
--- a/rest_framework/routers.py
+++ b/rest_framework/routers.py
@@ -65,13 +65,13 @@ class BaseRouter(object):
         If `base_name` is not specified, attempt to automatically determine
         it from the viewset.
         """
-        raise NotImplemented('get_default_base_name must be overridden')
+        raise NotImplementedError('get_default_base_name must be overridden')
 
     def get_urls(self):
         """
         Return a list of URL patterns, given the registered viewsets.
         """
-        raise NotImplemented('get_urls must be overridden')
+        raise NotImplementedError('get_urls must be overridden')
 
     @property
     def urls(self):
diff --git a/rest_framework/utils/encoders.py b/rest_framework/utils/encoders.py
index 73cbe5d8a..bf7532711 100644
--- a/rest_framework/utils/encoders.py
+++ b/rest_framework/utils/encoders.py
@@ -6,12 +6,13 @@ from django.db.models.query import QuerySet
 from django.utils import six, timezone
 from django.utils.encoding import force_text
 from django.utils.functional import Promise
-from rest_framework.compat import OrderedDict
+from rest_framework.compat import OrderedDict, total_seconds
 from rest_framework.utils.serializer_helpers import ReturnDict, ReturnList
 import datetime
 import decimal
 import types
 import json
+import uuid
 
 
 class JSONEncoder(json.JSONEncoder):
@@ -41,10 +42,12 @@ class JSONEncoder(json.JSONEncoder):
                 representation = representation[:12]
             return representation
         elif isinstance(obj, datetime.timedelta):
-            return six.text_type(obj.total_seconds())
+            return six.text_type(total_seconds(obj))
         elif isinstance(obj, decimal.Decimal):
             # Serializers will coerce decimals to strings by default.
             return float(obj)
+        elif isinstance(obj, uuid.UUID):
+            return six.text_type(obj)
         elif isinstance(obj, QuerySet):
             return tuple(obj)
         elif hasattr(obj, 'tolist'):
diff --git a/rest_framework/utils/serializer_helpers.py b/rest_framework/utils/serializer_helpers.py
index 65a04d06b..f99606039 100644
--- a/rest_framework/utils/serializer_helpers.py
+++ b/rest_framework/utils/serializer_helpers.py
@@ -16,6 +16,9 @@ class ReturnDict(OrderedDict):
     def copy(self):
         return ReturnDict(self, serializer=self.serializer)
 
+    def __repr__(self):
+        return dict.__repr__(self)
+
 
 class ReturnList(list):
     """
@@ -27,6 +30,9 @@ class ReturnList(list):
         self.serializer = kwargs.pop('serializer')
         super(ReturnList, self).__init__(*args, **kwargs)
 
+    def __repr__(self):
+        return list.__repr__(self)
+
 
 class BoundField(object):
     """