Other mistake: After the concert, when Dewey is telling Gordon how awesome the lights were, Eleni calls him Jack. The actor that plays Dewey is Jack Black. (This mistake is mentioned in the Kids Kommentary [sic].) (01:35:40)
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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More mistakes in School of Rock
Ms. Mullins: I've just been informed that all of your children are missing.
Trivia: Miranda Cosgrove, who plays Summer Hathaway, actually has a good voice and plays guitar. She had to take a 45-minute class to learn how to sing badly for the scene where she sang "Memories."
More questions & answers from School of Rock
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.