Audio problem: When the security guard is chasing Daffy around the set, Daffy says "Hoo-hoo!" but his beak does not move.
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 the Wolf jumps into the lion's mouth at the zoo, one of the stripes on McPoodle's sleeve changes color and then reverts back. Also note, the stripes on Sergeant McPoodle's uniform sleeves repeatedly change between pointing down and pointing up (despite the reveal in the cartoon's last shot, all stripes should be identical).
Continuity mistake: In a wide shot of the corridor when Bugs is running away from the red monster, you can see there is nothing on the wall by the door. When Bugs runs into the door, two wooden beams have appeared.
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 Elmer is chasing Bugs at the beginning of the cartoon, the ground is white, but when Bugs comes out of the log and pushes it over the cliff, the ground is green.
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."
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 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 plot is based on obtaining 3 music boxes, identical in appearance each playing a slight variation of the same tune. Throughout the movie the variations are highlighted as a message is revealed by listening to all 3 variations. Yet at the beginning of the movie when the boxes are all sold at the same auction, when each box is presented, the tune had no variations.
Continuity mistake: The postman hangs his bag to the hook on the wall. By the noise, he knows a split-second in advance that an explosion is about to happen, and ducks. The actor ducks out of view; we are not supposed to notice that once he disappears, film editing inserts the part when the background partially detonates. We however do, because the bag in the foreground changes position in the space of a single frame. (00:05:25)
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.