Continuity mistake: During the Benny Goodman "All The Cats Join In" segment, a teenaged girl gets out of the shower and hops into her underpants and skirt. Suddenly her feet are clad in white socks which were not there before.
Continuity mistake: When the state trooper examines the letter, the is no stamp. However, when Charlie Chan (Sydney Toler) examines the letter, there is a stamp present. (00:43:10)
Continuity mistake: When we see the cats lounging around, the bottle the drunken cat is holding has nothing on the label, but in the next shot it now reads "Arsenic and Old Grapes."
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.
Continuity mistake: When Elmer Fudd is holding the test tube to drop liquid into the solution, you can see there is nothing on the side of the tube, but in the next shot a measuring system suddenly appears.
Continuity mistake: When Daffy Duck appears from the mail box, the red flag is pointing up. In the next shot, it is pointing to the left.
Continuity mistake: The hotel door at the beginning of the short does not have a handle on it, but when the door opens in the next shot, a handle suddenly appears.
Audio problem: When Bugs says "That's the old ginger, boy!" when practising with his baseball bat, his mouth doesn't move.
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: After Bugs shoots the man in the audience for coughing, the style of notes in the music book in front of him changes between shots.
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 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.