- In real life, he was supposedly the funniest of his brothers despite always playing the straight man in their films.
- At the time of his death, he was the last surviving of The Marx Brothers.
- Was the tallest of the Marx Brothers even though he stood only at 5'8".
- His company, Marman Products, marketed and produced what came to be known as the Marman Clamp, which proved to have numerous applications in aircraft and aerospace, and is used to this day. The company eventually grew to two factories employing more than 500 workers. Marx would often hire studio prop men and unemployed big band musicians.
- He was a serious amateur machinist, and among the products his company, Marman, developed in the late 1940s was a 2-cylinder motorized bicycle, the Marman Twin (produced 1948-1949). Unfortunately, his bike was unable to compete with the more established Whizzers, despite being far more powerful. These bikes are highly collectible today.
- Throughout his life, he had many careers including inventor, talent agent, manufacturer, commercial fisherman, and grapefruit grower.
- Since he'd missed out when his brothers received their nicknames, he was given one by his siblings. He was always practicing acrobatics, so he was named "Zippo" -- after "Mr. Zippo," the star of a well-known chimpanzee act. Feeling it was unflattering, he insisted it be Zeppo. Another version of this story , was that his name was changed to "Zeppo" in honor of the then popular "Zepplin".
- When he married Barbara Marx, her son, Bobby Oliver, took the Marx surname, although Marx never legally adopted him.
- He was the only one of the Marx Brothers who was politically conservative.
- He and his first wife adopted their only child, Timothy, in 1944.
- According to Marc Eliot's Cary Grant biography (2005): "While the rest of the country preferred Groucho, Zeppo, the good-looking straight man and romantic lead, was [Grant's] favorite, the one whose foil timing he believed was the real key to the act's success." Grant even modeled his early Hollywood look and persona off of Zeppo.
- Officially left the brothers' comedy team to become an agent on March 30, 1934.
- One of only two of The Marx Brothers to play a recurring role in their films (not counting when they used their own names). He played the role of "Jamison" in both The Cocoanuts (1929) and Animal Crackers (1930).
- Ashes scattered at sea.
- He was portrayed by actor Alvin Kupperman in the Broadway musical "Minnie's Boys," which ran an at the Imperial Theatre for 80 Performances from Mar 26 to May 30, 1970.
- In the 1936 Puritan Pictures movie "The Reckless Way" a newspaper article is shown that mentions a Hollywood talent agent named "Zipper Marks", clearly a take-off on Zeppo Marx's name.
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