Continuity mistake: When Jerry launches his egg carton, there are initially three light bulbs in the back, but when he releases the bulbs, there are now four.
Continuity mistake: When Droopy is standing the door, he tells the convict he's going to call the cops. At this point you can see there is nothing next to Droopy on the frame, but in the very next shot a hinge has appeared.
Continuity mistake: When Bugs is watching the film of Cecil Turtle beating him on their last encounter, from behind there is no film on the projector reel when it is running, but when we see Bugs in the next shot, there is.
Continuity mistake: When the mice are serving the cat, there is a mouse who is taking the cat's order and he drops his notepad on the floor when he says "Mouse?" and runs off. But when we see a full view of the cat and the mice in the next shot, the notepad is nowhere to be seen.
Continuity mistake: When we see Mr Meek with his axe at the beginning of cartoon, you can see there is nothing in the fence beside him, but in the next shot, wire fencing has suddenly appeared.
Continuity mistake: When Daffy gives Porky his card, Porky holds it with both hands but a close-up of the card shows him holding it with only one hand.