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 Sylvester runs to the window when pursued by Tweety, there is a door next to him that has a number "19" on it. But when we see Sylvester looking out of the window, the "19" on the door has gone.
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 Bugs reaches the top of the stairs in Bedlam Manor, Yosemite Sam (dressed in a suit of armour) tries to chop off Bugs' head with an axe, but Bugs ducks and Sam falls down the stairs. When we see Sam falling down the stairs in the next shot, Bugs has disappeared.