Corrected entry: In the last scene, we see DJ and Chowder running off to go trick-or-treating. As the camera view zooms out, we see a column of smoke rising up from the ruins of Nebbercracker's house. A logical explanation for this would be the chimney of Nebbercracker's house. However, the house has been blown to smitherines in the previous few scenes.
Corrected entry: In the last scene, Chowder and DJ go trick-or-treating, yet they have nothing to carry their candy in. No bags, nothing.