Chazz: Who'd win in a wrestling match, Lemmy or God?
Chris Moore: Lemmy.
[Rex imitates a game show buzzer.]
Chris Moore: God?
Rex: Wrong, dickhead. Trick question. Lemmy is God.
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.