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Continuity mistake: During the shooting between Bats, Darling and Buddy with the guy in the white suit and the "cops" Darling gets shot in the right arm then she keeps shooting and moves back, but in the next shot she is at the front again.

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Continuity mistake: Towards the end while Baby is being arrested at the bridge, the sun changes between shots.

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Continuity mistake: After Beethoven gets the bagel from the bakery then he shares with the other small dog, the bread changes color from dark to light.

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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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