*Harpo was the first brother to appear on screen in a widely released film, having been cast in Too Many Kisses as "The Village Peter Pan." It was in this role that Harpo spoke the only line he would ever speak in front of a movie or TV camera: "You sure you can't move?" But as it was a silent movie, audiences still didn't hear his voice.
*All the brothers and their real names were as follows:
- Manfred, born in 1885 and died in infancy
- Chico — Leonard, (March 22, 1887–October 11, 1961)
- Harpo — Adolph (after 1911: Arthur), (November 23, 1888–September 28, 1964)
- Groucho — Julius Henry, (October 2, 1890–August 19, 1977)
- Gummo — Milton, (October 23, 1892–April 21, 1977)
- Zeppo — Herbert, (February 25, 1901–November 30, 1979)
*The movie At The Circus was originally entitled "A Day at the Circus" it was to be the third in the Brothers' "Day/Night" series after A Night at the Opera (1935) and A Day at the Races (1937)
In the same movie, the scene in the midget's trailer was the only time Harpo Marx was even vaguely heard on-screen (when he sneezes).
*In the movie The Cocoanuts:
- All paper used as props is soaking wet. This was done to prevent overloading the early sound equipment with paper-crinkling noise.
- Harpo's red wig looks black in this movie. For all subsequent movies, he wore a blonde wig to make it look lighter on film.
- During the day, the Marx Brothers worked on this movie. At night, they were starring in "Animal Crackers" on the stage.
- During the "Why a duck?" sequence, it seems that Groucho almost calls Chico "Ravelli", which is Chico's character in Animal Crackers. Since they were shooting The Cocoanuts in the morning and acting in Animal Crackers at night, this mix up is understandable.
PS- Is anybody else in love with Harpo's mirror scene in the Big Store!? You know the one where he is playing the harp and his reflection is playing the cello, and his other reflection is playing the violin? That's definately one of my most favourite Harpo scenes ever.