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Trivia: There were reportedly a lot of issues on set, as the studio and director Gavin Hood had constant disagreements over the film, with Hood wanting to explore Logan's past and trauma, while the studio wanted him to remove most of those scenes to add more action. Producer Richard Donner (director of the original "Superman" film) had to fight with the studio to keep Hood employed. There are rumors things were so strained, Donner directed many scenes and reshoots (uncredited) to help ease tensions.

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Trivia: Liev Schreiber was originally supposed to wear a fake muscle-suit to look physically imposing. He begged the filmmakers to give him time to train and try to gain more muscle mass, as he felt humiliated wearing the suit. His request was granted, and he ended up gaining nearly forty pounds of muscle after months of training, and no longer needed the muscle suit.

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Trivia: This was meant to be the start of an on-going "X-Men Origins" series of films, but the idea was dropped after this film was met with a mixed reception from critics and fans.

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Trivia: The only X-Men film to feature fan-favorite character Gambit. He was meant to appear in the previous films, but his part was always written out during pre-production. He was also meant to have a spin-off movie after this film with Channing Tatum taking over the role, but it never got off the ground.

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Trivia: A DVD-quality version of a rough cut of the film was leaked online only about one month before the film was released in theaters. With the exception of unfinished sound and effects, and a different font in the opening credits, the workprint was nearly identical to the finished film.

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Trivia: Hugh Jackman has admitted he was disappointed with the finished film, and sought to do the character justice with the sequels, "The Wolverine" and "Logan," which were far better received by critics and fans.

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Revealing mistake: When the mutants all run to Xavier and the helicopter towards the end of the film, it's blatantly obvious the actors were filmed running on a green-screen and then comped into the scene. The lighting on the actors doesn't really match the background, and somewhat more noticeably, they also don't cast any shadows on the ground.

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