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Trivia: At the theater where Evan and the others go, the films Seven and Dumb and Dumber are shown both from the maker of this film, New Line Cinema.

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Trivia: William Smith who plays the father of Conan was also a bodybuilder and was offered the opportunity to play the role of Conan but refused.

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Trivia: Kiyoshi Yamazaki who was the instructor of Arnie, Sandahl Bergman and Gerry Lopez makes a cameo as the Conan fighting instructor.

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Trivia: The way Kick-Ass looks at the mirror and when he tries to jump over a building resemble the way Tobey Maguire did in Spider-Man.

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Trivia: At the theater Clayface is watching "The Terror" a movie starring Jack Nicholson, who played the Joker in 1989's Batman.

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Continuity mistake: While the bullies are playing with Ted on the bus he stands up and they follow him but they stand up from the seat twice.

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Continuity mistake: At the story told by Gordie about the kid eating pies, at the last pie his face cleans up a little bit between shots.

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Trivia: The psychiatric hospital where Evan goes is the same on seen in Halloween: Resurrection and Final Destination 2.

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Continuity mistake: Just after Supes heard Lex with the ultrasound, he flies down to the street but at the last second he disappears.

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Trivia: Director Tom McGrath plays the voice of the foster father of Metroman and one of the prison guards.

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Other mistake: George should be dead or at least seriously injured after he falls from the roof of the warehouse.

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Revealing mistake: Towards the end while Vernon and Harvey are holding Beethoven the head of the dog is a dummy.

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Trivia: The guys infected by the serum Titan are very similar to Amigdala another enemy of Batman.

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Trivia: At the morgue there is a corpse which later disappears, that body belongs to Ra's Al Ghul, famous for endlessly returning from the dead.

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Continuity mistake: While the dogs are chasing Conan, the sun changes between shots.

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Trivia: Jack Black had to make a video playing Immigrant Son from Led Zeppelin in order to get permission to use that song for the film.

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Trivia: The nicknames given to the kids by Mr. S were improvised by Jack Black in order to remember every single name of the boys.

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Trivia: The Mooney Suzuki rock band was involved in the film and also makes a cameo when Mr. S and the kids are about to have their audition.

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Continuity mistake: After Jack strangles the police officer there are 3 guys by the door - he knocks down one of the them but in the next shot there is just one man left.

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Continuity mistake: When Kersey is writing the fake ID for the hospital he drops a piece of paper beside the trash can but the paper disappears in the open view, then reappears when Geri takes it.

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