Chazz: Whose side did you take in the big David Lee Roth/Van Halen split?
Chris Moore: What?
Marcus: What kind of question is that?
Chazz: Who's side did you take, Halen or Roth?
Chris Moore: Van Halen.
Ian: He's a cop.
Towards the end of the movie when Chaz and the band are rebelling on stage and wrecking all the equipment, there are a few shots where you can clearly see that Brendan Fraser is only pretending to smash his guitar.
When Chaz is outside the radio station confessing to his girlfriend that his real name is Chester and he was a geek in high school, the guy in the crowd who shouts out "I was the editor of the school magazine" is Lemmy Kelmister, the lead singer of the metal band Motorhead.