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Revealing mistake: When the car Howard Saint is tied to explodes, watch Howard's body - it's clear that he's been replaced with a hilariously obvious dummy. It's especially comical if you look at his legs, because it appears that the dummy doesn't even have legs inside of its pants given how they "wobble."

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Trivia: The studio originally wanted Amanda Seyfried for the role of Gamora. But despite loving the screenplay, Seyfried feared that given the obscure nature of the characters and the inherent weirdness of the script, the movie would bomb at the box office. She didn't want to be in the only MCU film to fail commercially. The film ended up going on to be a massive success, and Seyfried has expressed some regret over the decision.

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Revealing mistake: When Frank kills Howard Saint at the end of the film, pay close attention when the cars start to explode. About a second-and-a-half after the first explosion, the camera cuts to a high-angle shot looking down at the cars exploding. Pay attention and you can see a lot of errors. For example, there are two cars (one red and one blue) on the right side of the screen that are teeny-tiny models and aren't properly blended into the background with blurry edges around them. Additionally, the three cars on the bottom left of the screen also have noticeable black lines around them. (Likely from a poor compositing job.) It appears the shot was created with different miniatures layered over a background plate, and the various miniatures weren't properly comped into the shot.

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Trivia: The studio originally wanted Jessica Chastain for the role of Dr. Palmer. However, Chastain turned the supporting role down because she knew taking it would take away any chance of her getting offered the role of a superhero in the MCU in the future. She said she'd rather play a caped hero in a future film.

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Trivia: Some of the dolls from the story "KKK Comeuppance" were reportedly recycled and re-used for the film "Team America: World Police."

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Trivia: The stuffed rabbit was originally meant to be a real rabbit, but this was changed during production for safety reasons and due to the complexity and gruelling nature of the film.

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Trivia: Spoilers: Director William Eubank has confirmed that the enormous monster seen at the end of the film is indeed meant to be Cthulu from the stories of H.P. Lovecraft.

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Trivia: The priest in the story "KKK Comeuppance" is played by director Rusty Cundieff's father. Additionally, the woman who briefly plays Miss Cobbs at the end of the same story is played by Cundieff's mother.

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Trivia: "It" director Andy Muschietti reportedly helped give the production tips and advice on how to put together a horror movie during pre-production.

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Trivia: The final film released under the "20th Century Fox" banner, which was redubbed "20th Century Studios" after Disney bought the studio from Fox.

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Trivia: The man who opens the safe at the beginning of the film was played by Weston Nathanson... however, his voice was provided by director Joss Whedon. As is often the case, Nathanson's lines had to be re-recorded in post-production, but Nathanson wasn't available. Joss stepped in and dubbed the lines himself.

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Trivia: Reportedly, both the PG-13 theatrical and unrated cut of the film were screened for test-audiences, but it was ultimately decided that the PG-13 version would be released in theaters. The unrated cut was eventually released on Blu-ray, featuring a bit more violence and more visible bloodshed.

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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: Guillermo del Toro originally wanted to direct the film and had talks with Hugh Jackman and the producers, but ultimately dropped out due to the massive time commitment the film required.

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Revealing mistake: When Liu transforms into a dragon during the final battle, the wideshot where he actually transforms while being held by Kahn is completely laughable. The digital dragon clips through portions of the live-action background (particularly around Khan's arm that was hanging onto Liu) and the lighting on the dragon doesn't match with the lightning flashes in the background.

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Revealing mistake: When Smoke is running up to Kitana at the start of the Liu VS Smoke fight, Liu runs up behind him, jumps and pushes his foot against a pillar to sort of rebound, and grabs Smoke. There's a quick insert shot of Liu's foot pushing against the pillar, and you can see the "stone" pillar briefly bend like rubber beneath his foot, revealing it's fake.

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Trivia: Nightcrawler was meant to have a cameo in the film to explain his absence, but the producers and director unfortunately decided it wasn't worth the cost of rehiring Alan Cumming and doing a day's worth of prosthetic work with him.

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Trivia: Hugh Jackman wouldn't drink any liquid for a day-and-a-half before any of his shirtless scenes in order to take off any water-weight and give his physique an exaggerated "ripped" look. He said that the process was unpleasant and made him light-headed, but he was pleased with the results on-screen.

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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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