Continuity mistake: When the cats are fleeing after hearing "Lassie", you can see that the front door has molding on it. But when the kitten lowers the doorknob to jump through the keyhole, the door is plain. In the next shot, when the drunk cat dives for where the doorknob was and hits the door, the molding is back, and when he falls to the floor in the next shot, the door is plain again.
Continuity mistake: When Elmer is in the log, he puts out his hand to make sure he is on the ground and you can see there is a rock by the log. When Elmer breaks up his shotgun in front of Bugs, there is now no sign of the rock.
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: 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.
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: The Cadillac limo changes models at times, also having blackwall or whitewall tires.
Continuity mistake: Johnny and Toby are heading to a frog pond. Johnny stops by a fence and considers taking a shortcut through the pasture until Toby warns him of the bull in the pasture. When the two boys turn around, the fence is suddenly several feet away.
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 Rocky says his prayers and gets into bed, he has a gun belt around his nightshirt. But when he jumps out of bed after seeing Bugs, the gun belt has disappeared.
Revealing mistake: Just before she KOs the lecherous producer, Peggy Harper gives him a big stomp on his right foot. Or that's what it was supposed to look like because the adorable Betty Hutton just slams her foot on the floor at a very safe distance from Howard Freeman's. (00:24:15)
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.
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.