Trivia
When Julius visits Vincent in prison, Vincent calls him "Mr. Universe", a title that Arnold Schwarzenegger held for several years, 25 years previously.
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Two real life twins were reunited with their father after seeing him in the scene set in downtown Santa Fe.
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The money was not available to pay to the two main stars and the director their normal fees. They decided to split a percentage of the gross profits between the three of them and ended up making more than they would have made taking their fees upfront because the film was such a hit.
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Arnold Schwarzenegger, Danny DeVito and Hulk Hogan have all revealed in interviews that Schwarzenegger and DeVito were given the option of doing this movie or Suburban Commando; had the two chosen Suburban Commando, Hogan and Christopher Lloyd would have done this movie.
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During production the title was briefly changed to 'Brothers' to avoid confusion with David Cronenberg's Dead Ringers which was at that time also called 'Twins'.
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Throughout the movie, Julius tells everyone he meets that he is from an island (shown at the beginning of the movie) in the South Pacific 300 nautical miles (350 miles) SSW of the Fiji Islands. Although the island depicted in the movie is fictional, there is indeed a VERY small island 350 miles in the SW/SSW direction of Fiji known locally as Ceva-I-Ra. Ceva-I-Ra (also known as Conway Reef) is an atoll-type coral reef stretching just under 2 miles long with a tiny sand cay (with some vegetation) in the center approx. 2 hectares in area.
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When Julius goes to his mother's old house and meets up with Granger (one of his and Vincent's six fathers), Granger's grandchildren are played by Jason Reitman and Catherine Reitman -- the real-life children of director Ivan Reitman.
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Even though their characters are supposed to be twins, Arnold Schwarzenegger is actually three years younger than Danny DeVito. Kelly Preston and Chloe Webb's characters are also supposed to be twins, but Webb is six years older than Preston.
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Arnold Schwarzenegger had been wanting to do a comedy for years after several action movies; Twins was his opportunity.
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The original title was "The Experiment" but it was dropped because of Arnold Schwarzenegger's Germanic background.
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Arnold Schwarzenegger, Danny DeVito and Ivan Reitman were all realistic and levelheaded about business and thought Twins might be a difficult sell. But when watching the dailies they knew the film was a hit after people laughed at six takes of a scene.
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Schwarzenegger got 20% of the profits, and made $35,000,000 through international sales, video/DVD sales and TV screenings. He earned more money from Twins than any of the Terminator movies.
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