Continuity mistake: When the Big Bad Wolf has finished hammering in the sign at the beginning of the cartoon, he is holding a hammer in his right hand. When he tells his nephew to put their rabbit outfits on, he holds up his right hand but the hammer he was holding a few seconds ago has disappeared.
False Hare (1964)
1 continuity mistake - chronological order
Other mistake: When the Big Bad Wolf is demonstrating to Bugs how to ring the bell properly (so the trap works), his hand lands on the side of the bell instead of the top, yet the trap still works and the bell still dings.
Trivia: The final Bugs Bunny cartoon produced at Warner Brothers.