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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Ms. Mullins: I've just been informed that all of your children are missing.
Trivia: During ending credits, when the band is playing, the actors were all wearing their own clothes. The bass player (Katie) actually had a solo as well, but the editors cut it out.
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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.