Continuity mistake: When Merlin turns Bugs into a pig, Bugs pulls off his pig costume and leaves it on the floor. But when Bugs turns Merlin into a horse, the pig costume is nowhere to be seen.
Continuity mistake: When Bugs is reading his book, he puts his carrot on the stand next to him. But when the apple falls on his head, the carrot has disappeared.
Continuity mistake: When we first see the book that Bugs is reading at the beginning of the cartoon, there are words on the front cover and spine. In the next shot, the words have gone.