Continuity mistake: When Peter Pig and Donald Duck are dancing outside the "Idle Hour Club", you can see the door to the Club is open, but when the camera cuts to Donald, the door is shut, and in the next shot, the door is open again.
Continuity mistake: When Tom is on trial, the large crowd is there to witness. Barnaby is there, thinking he got away with his ploy. There is a man standing next to Barnaby who disappears from the wide shot and reappears in the closeups.