Continuity mistake: When the two men talk in the tent at the beginning, watch when one turns around - there is a clear cut in mid action where the men's positions change without any movement. (00:13:05)
Continuity mistake: When Chico and Harpo bring Groucho ice in his office at Huxley College, Harpo is wearing some kind of earmuffs. Between shots they change from going round his chin to behind his head.
Continuity mistake: The natives approach the ship; one in particular is shown swimming putting her feet right against the bow. One of the crew members pours their drink in the ocean; there's a sailor that walks behind him and makes a sharp left turn. Next shot, and the man is gone, but reappears a second later from the original starting point repeating the walk and turn. (00:05:30)
Continuity mistake: When the Baron is dead and Mr. Kringelein enters in the room, he kneels by him and says a few lines about him looking peaceful. His left arm is on the chair in a position different from the shot before and after, where the hand is at the end of the armrest.