Continuity mistake: When the inebriated cuckoo pops out of the cuckoo clock at the beginning of the short, his feet are yellow, but when we see a close-up of the cuckoo in the next shot, his feet are now orange.
Continuity mistake: When Tom picks up a telephone book, you can see he is holding the book with both hands, but when we see a close-up of the "Ajax Mouse Exterminators" in the next shot, his hands are nowhere to be seen.
Factual error: When the camera pans to the theatre right after the opening credits, the sign uses the British spelling of "theatre" instead of the American "theater."
Continuity mistake: When Bugs begins his performance, he takes a carrot from the far end of the piano, takes a bite out of it and puts it back. When we see Bugs performing a couple of shots later, the carrot has disappeared.
Continuity mistake: When the kitten says "cheese" when Sylvester is talking to the other cats after fleeing Porky's house, Sylvester slaps him and you can see there are footprints in the snow. But after a quick cut to Sylvester saying "listen!" we return to the cats and the footprints have disappeared.
Continuity mistake: When Bugs starts singing "Someone's Rocking My Dream Boat" when he is dreaming, you can see the side of his boat has nothing on it. When he throws out the anchor, the words "Dream Boat" have appeared.
Continuity mistake: When the scientist locks the door to prevent Bugs from escaping, you can see the latches are made of metal, but in the next shot they are now made of wood.
Continuity mistake: When we see Toodles in the window of her bedroom, the shutters have nothing on them, but in a close-up in the next shot, hooks have suddenly appeared.
Continuity mistake: When Daffy steps out of the bus at the beginning of the short, he drops his suitcase on the pavement. When we see Daffy in the next shot, the suitcase has gone.
Continuity mistake: When the convict trips outside the plastic surgeon's office, the sign on the window reads "plastic surgery" which changes to "plastic surgeon" in the very next shot.