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Trivia: The oil during the oil fight was reportedly a syrup made primarily of molasses since it looked enough like oil and was safer to work with. It unfortunately had the side effect of making everyone and everything incredibly sticky for shooting of the scene.

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Trivia: Zendaya was considered for the role of Storm, but ultimately not chosen. The following year she would appear in another Marvel film - "Spider-Man: Homecoming."

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Trivia: The scene of Scott's powers appearing in a school bathroom as a teenager was written for the original "X-Men" but never filmed for time and budgetary reasons.

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Trivia: The original title of the film was "X-Men: Age of Apocalypse." This was changed because coincidentally, around the same time, three other films with "Age of..." in their titles had come out: "Avengers: Age of Ultron," "Transformers: Age of Extinction" and "The Age of Adeline."

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Trivia: Getting the character Quicksilver into the film was a bit of a legal minefield. Both Marvel Studios and Fox wanted to use the character in their own projects, but there wasn't any sort of formal agreement over him. Eventually, a resolution was reached - Quicksilver could appear in "Days of Future Past," but with no references to "The Avengers" or the Marvel Cinematic Universe. And he could similarly appear in "Avengers: Age of Ultron," so long as there were no references to mutants or the X-Men.

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Trivia: Darren Aronofsky was attached to write and direct at one point, but dropped out of the project after six months. The studio reportedly didn't like his script, which was also far more brutal and featured heavy sexual content.

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Trivia: The movie originally started as a prequel to the original "X-Men," but was retooled into a sequel to the initial film trilogy.

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Trivia: The original ending featured Wolverine being given his classic comic costume by Yukio, but it was cut from the film.

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Trivia: While technically a prequel to the previous films, director Matthew Vaughn chose to ignore some pieces of continuity from the previous films (particularly the third film and "Origins") to help the movie stand on its own, and be able to be seen as a prequel, a reboot or both.

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Trivia: Stan Lee was meant to have a cameo, but was unable to because the shoot was happening too far away from him, and he didn't feel up to traveling.

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Trivia: Director Matthew Vaughn was originally slated to direct "X-Men: The Last Stand," but dropped out of that film over worries about the rushed schedule. He finally returned to the series with this film.

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Trivia: There was going to be a scene where Xavier and Emma Frost had a mental "battle" where they would fight inside their minds, but the idea was dropped. A similar concept was eventually used in "X-Men: Apocalypse," in which Xavier and Apocalypse battle inside of their minds.

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Trivia: Much of Magneto's storyline was apparently loosely based on the "X-Men Origins: Magneto" film that was never made.

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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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Trivia: The climax was originally meant to take place in Washington DC, where the lab would have been set, but director Brett Ratner decided to relocate the lab to Alcatraz and rework the ending to take place there.

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Trivia: Patrick Stewart has said preparing for the role of Xavier was the most fun he's ever had preparing for a role, because the studio was constantly sending him comic books to read.

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Trivia: The studio was hesitant about the film and didn't want to take a big financial risk on it. Thus, they reduced the budget to $75 million in comparison to the $90-$100 million many other blockbusters at the time cost.

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Trivia: While they look great on-screen, reportedly the leather costumes the cast wore were a massive pain behind the scenes. They were so stiff at the start of the shoot, the cast could barely move in them. The first day of shooting, the cast was supposed to hop over a small ledge, and none of them could do it because the suits weren't flexible enough. Thankfully, the suits eventually began to loosen up the more the cast wore them.

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Trivia: Hugh Jackman would start getting into character by taking ice-cold showers every morning the instant he woke up. They put him into an angry mood that he would then use for the character. He reportedly continued the tradition with every sequel.

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Trivia: The main character's last name is "Corvis," which is similar to "corvus," the Latin word for "crow."

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