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The Triumph motorcycle ridden by Marlon Brando is actually his own.
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The film is based on the events in the town of Hollister in 1947, when several biker gangs rioted during the annual motorcycle rally.
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The American rock band Black Rebel Motorcycle Club is named after the motorcycle club from the film.
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Stanley Kramer (1913-2001) hired real bikers. When one of them was asked what exactly they were rebelling against, he replied: "Well, what ya got" — and this slang expression was added to the script.
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Lee Marvin (1924-1987) was actually drunk during the filming of some scenes, and his on-screen rivalry with Marlon Brando (1924-2004) extended beyond the set as well.
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While preparing for the shoot, Marlon Brando became interested in motorcycles and the corresponding lifestyle again; he diligently practiced his motorcycle riding skills and picked out his wardrobe himself. In addition, the actor spent a considerable amount of time in the company of real bikers, observing how they behaved and talked.