At the start of the road race, the starter has a green flag. When we cut away to the stock footage, the starter has a red flag.
During the race scene, Eric Von Zipper is riding motorcycle #13 when he wipes out in the grease he's riding #21 and then a few seconds later he's back on #13.
When Von Zipper sings on top of the pool table, right before he falls through the table a quick cut takes us from a blue felt topped table to a green felt topped table, which likely had been swapped with a table top rigged to break. But the felt color clearly changes.
When Ricky and North Dakota Pete are fighting in Ricky's house, they in front of the bedroom with its Japanese sliding doors opened. As Pete gets ready to throw Ricky into the bedroom, someone off-camera slides the doors shut so he goes through them, smashing them in the process.
During "That's What I Call a Healthy Girl," Johnny appears to play a guitar solo, but he's just strumming the instrument, as if playing rhythm guitar, instead of playing the actual melody.
One of The Kingsmen is plucking a white guitar as if it's a bass guitar, but it's a six-string guitar, like the other guitar player is using.
When Mickey Rooney first appears, the surfers ask his name. He replies, "J. Peachman Keene" instead of Peachmont.