Continuity mistake: When Elmer picks up Brunhilde (Bugs), his spear is behind him, but in the next shot, it has disappeared.
Continuity mistake: When Elmer says "That was the wabbit!" he picks up the spear in his right hand. But when he is chasing Bugs, he is holding the spear in his left hand, and when he sees Bugs on the horse, the spear is back in his right again.
Continuity mistake: When Elmer is stabbing Bugs' hole with his spear, there are rabbit tracks around the hole. But when Elmer says "I'm going to kill the wabbit!" the rabbit tracks have disappeared.