Continuity mistake: In the scene where Dewey and Ms. Mullins are in the bar, the shots from behind Ms. Mullins sitting down show that her left hand is on the table. However, the shots showing the front of Ms. Mullins show her arms folded.
School of Rock (2003)
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Directed by: Richard Linklater
Starring: Jack Black, Joan Cusack, Mike White, Adam Pascal
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Trivia: All of the children are competent musicians, and they are all playing their own instruments.
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Answer: It is never said but If I was to guess, they got it from the guy he was pretending to be (Ned's) information from the school office.