Continuity mistake: When Daffy enters Bugs' living room wearing a rabbit costume, you can see the door is plain green. But when Elmer Fudd enters to confront Daffy, the door is now divided into three sections.
Continuity mistake: When Sam knocks on the bathroom door, he says "Get outta there!" and Bugs opens the door on him. You can see that Bugs opens the door outwards when this happens, but when Sam barges in on Bugs later on, the door opens inwards.
Continuity mistake: When Wile E. Coyote is preparing the picnic, you can see that next to his knee there is a footprint on the ground, but when Bugs joins him in the next shot, the footprint has disappeared.
Continuity mistake: When Dr Jekyll enters his laboratory at the start of the cartoon, he locks the door with his key. After drinking the Hyde Formula, he turns into Mr Hyde for a short time before going back to Dr Jekyll. When Jekyll leaves the laboratory, he opens the door without unlocking it.