Other mistake: When Harpo and Chico are shooting spitwads at Groucho in the classroom, Groucho's line gets cut short when he is hit flat on the side of the head with a book. He then falls back and says, "You got me" and if you listen closely you can hear someone laugh in the background.
Horse Feathers (1932)
1 other mistake
Directed by: Norman Z. McLeod
Starring: Chico Marx, Groucho Marx, Harpo Marx, The Marx Brothers
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.
Professor Wagstaff: Why, I'd horsewhip you if I had a horse.