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Trivia: Actor Christopher Mintz-Plasse was only 17 during the filming of the movie, creating some problems with shooting due to child labor laws. During pre-production, he was not allowed to see certain props or items from the film (such as Seth's phallic drawings), and his sex-scene had to be very carefully monitored and edited, as certain "actions" (such as too much skin, certain types of movements or positions, etc.) would violate the law.

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Trivia: Long time friend of Sam Raimi, and star of his "Evil Dead" trilogy, Bruce Campbell was approached for a role in this film, but had to turn it down due to a time conflict with his television show "Burn Notice."

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Trivia: Sam Raimi's brother Ted Raimi has a brief cameo as the doctor who speaks with Justin Long in the hallway after the initial first attacks. You never see his face, but you see him from behind and hear his voice. Ted has appeared in numerous Sam Raimi films, including the "Spider-Man" trilogy.

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Trivia: In the English dub of the film, Anna Paquin voices Ray Steam, Alfred Molina voices Edward (Ray's father) and Patrick Stewart voices Lloyd (Ray's grandfather). The three also share another connection in real-life. Paquin and Stewart co-starred in all three "X-Men" films, which were created by Marvel, and Molina starred in another popular Marvel comic-turned-film, when he appeared as the villain in "Spider-Man 2."

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Trivia: A post-credit sequence in this film hints at a third "Hellboy: Animated" film that would feature a popular character from the comics named "Lobster Johnson." However, the studios were not pleased with the DVD sales for the first two "Hellboy Animated" films, and all production on the third has been put on hold.

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Trivia: Patrick Melton and Marcus Dunstan, the writers of both "Saw IV" and "Saw V", have a cameo in the flashback of Hoffman being kidnapped and meeting Jigsaw for the first time. When Hoffman is about to get on the elevator right before getting kidnapped, Dunstan is the second man to exit the elevator (he is in black and has a beard), right after the snobbish woman. Melton is the tall man who exits the elevator last before Hoffman enters.

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Trivia: At one point, Strahm's head-trap was going to be featured at the end of "Saw IV", but it was eventually decided by the filmmakers that the trap was strong enough that it could be one of the featured traps in "Saw V."

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Trivia: The elderly couple who notices Jill Tuck in the waiting room near the beginning are actually the parents of the film's casting director, and the receptionist in the scene is played by a receptionist who works for Twisted Pictures (which produces the "Saw" films) in real life.

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