Corrected entry: A sailor says he knows there are four stowaways on the ship because he "heard them singing 'Sweet Adeline'", a song usually performed by a barbershop quartet. However, Harpo was always silent so the sailor would have heard only three voices.
Monkey Business (1931)
1 corrected entry
Directed by: Norman Z. McLeod
Starring: Chico Marx, Groucho Marx, Harpo Marx, The Marx Brothers
Genres: Comedy
Other mistake: A crewman tells the ship's captain he knows there are four stowaways because he heard them singing "Sweet Adeline," a popular barbershop quartet song. Harpo never spoke in any of the Marx Brothers films. The crewman could not have heard four voices.
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Trivia: At one point, Thelma Todd is telling Groucho that she is living unhappily (and wants "freedom, liberty, justice, etc.). Groucho responds, "I know, I know, you're a woman who's been getting nothing but dirty breaks her whole life. Well we can clean and fix those breaks, but you'll have to stay in the garage all night." Less than four years later, Thelma Todd died of carbon monoxide poisoning as a result of being locked in a garage with a running car. There has been much controversy as to whether her death was an accident or not, even to this day.
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Correction: That's the whole point of the gag - he heard a song normally sung by a barbershop quartet and so assumed there were four singers.