Continuity mistake: When Bugs Bunny pushes down the door to escape from Mr Hyde in the closet, there are some hinges and nails on the floor when he runs into the laboratory. But when Dr Jekyll emerges from the closet, there is now one hinge on the floor.
Continuity mistake: When Bugs Bunny sees Mr Hyde, he lets go of Hyde and you can see that he is holding an axe in his left hand. But when Hyde grabs hold of Bugs' tail when he is shouting for Dr Jekyll, the axe has gone.
Continuity mistake: When Dr Jekyll takes Bugs Bunny back to his new home, Bugs is holding a carrot in his left hand. But when he jumps onto Dr Jekyll and says "Carry me?" in the next shot, the carrot has disappeared.