Continuity mistake: When the milkman is drinking milk in the bar and talking to the Tony the Tiger actor, the amount of milk in his glass changes with the different camera angles. It goes from 2/3 full to mostly full to half full back to mostly full. (00:54:56 - 00:55:45)
Continuity mistake: When Schwinn bites a corner of the Dingus, he bit the left-side corner. The next shot shows the right-side corner of the Dingus bitten off. (00:58:15)