Continuity mistake: When the bull sends the wolf flying out of the stadium, you can see there is nothing in the wolf's hands. But when he lands in the cactus, he is now holding his cape. The cape disappears when he is joined by the bull later on in the cartoon.
Continuity mistake: When we see the wolf reading a magazine in his room, he is holding the magazine with his left hand, but a close-up shot shows him holding the magazine with both hands.
Continuity mistake: When the bull crashes into a poster of a ballet dancer, there is a ballet dress on the bull's back. But when we see the bull a few seconds later, the dress has gone.