Continuity mistake: When the construction worker sees a bird in front of him, he says "Ha!" The worker then sees the city below and falls. At this point, you can see the worker is holding his hat in his left hand, but when he falls through the first plank of wood, the hat is nowhere to be seen.
Continuity mistake: When we see Sylvester reading his newspaper at the start of the cartoon, you can see the front page has only one picture on the cover, but when we see a close-up of the picture in the next shot, another picture has appeared under it.
Continuity mistake: When Bugs is sitting on the bench in Central Park with the other out of work actors, he has stubble on his chin. When Bugs accepts Elmer's role as his sidekick in his vaudeville act, the stubble has disappeared.
Continuity mistake: Jim Hawkins is stabbed in the shoulder, but when the doctor later treats and binds the wound, it has moved to his upper arm. (01:20:25)
Continuity mistake: When Annie finishes her song about "doin' what comes naturally," she grabs her rifle and uses the butt to shoo the children towards the house. The man she is talking to is close enough that she could touch him with the gun if she wanted too. The shot changes to a longer shot of the same view and the man is suddenly 5 or 6 feet further away, where the gun would no longer reach him.