When Wyatt swings one of the tree props at Grating, you can still see some of the outline of the tree.
Goof: Flaps said that Dumbo waved his flag at the end of his film, but the flag was actually shown during the scene where Dumbo attempted a stunt before he discovered his talent.
When Bonkers puts on the Circle Beanie, he's still wearing his police uniform. Then he dives underground with it on. Later on, though, when he comes back out, he's now wearing his green sweater from his old cartoons!
In the scene where Bonkers' guests are supposed to break out of the closet when Bonkers says "Panic"; right before they come out, Miranda's wearing a sweatshirt. But when they all come out, for one fleeting frame, she's in uniform.