On the safe that says, "Stiffany's," the apostrophe is missing.
In one scene, the black from Choo Choo's tail has vanished.
In one scene, grass is seen under TC's garbage can that has never been seen before.
Halfway through, TC sells Brain for the car. However, they never get Brain back, and Brain is not seen again until the next episode.
When Muggsy tells Fifi what they will do with Benny when Big Gus arrives, Fifi is mouthing what Muggsy says.