Corrected entry: When the 5678's start to play "woohoo" the lead singer doesn't move her lips when the opening "woohoo" line is sung and the guitar player and drummer are not in position to play. we see a quick cut and the band is jamming.
Kevin Snow
12th Feb 2005
Correction: This was intentional, and is used in movies all the time. You hear an upcoming scene overlapping, and then a cut brings us to it. It's done for effect.