Continuity mistake: When Dum-Dum cuts the rope releasing Chug-a-Boom from the balloon, we cut to the car and you can see Clyde and Dum-Dum are surrounded by the rest of the Ant Hill Mob, but when we see the two in the next shot, the other members are nowhere to be seen.
Continuity mistake: When the Hooded Claw tries to kill Penelope, by tying her to a stage coach that is calculated to hit the passing train, The Anthill Mob end up on the track. The train runs them over which flattens the car and Pockets uses a spatula to get the car off him. When the car pops back into its original shape, Pockets is supposed to be lying flat on the railroad, but he can be spotted in the car.