Continuity mistake: When Hugh Grant is performing his song "Meaningless Kiss" for the 'Class of '87 Reunion' - during the intro to the song, a shot is taken from the side of the stage where the manager is standing. The headphones are shown resting on top of the mixing desk. It then switches to the manager who has the headphones up to his ears - which he then puts down onto the mixing desk.
flush_the_hamster
6th Sep 2010