In the last scene when the band is trashing the stage and instruments, Chaz pretends to smash a PRS guitar, actually just slowing his swing to not hit the full stack guitar amp, only pretending to smash it.
When Beech initially goes through the air vent in the ceiling looking for a cell phone it shows the top of the desk with the cell phone there, a Rolodex card falls next to the cell phone. The camera then pans back to Beech who looks around, then the camera pans back to the top of the desk where the cell phone is showing, however the Rolodex card is no longer there.