In the scene where Balmudo is "alone," while Johnny and the guys are walking to the door, he lights a cigarette. When he asks for a comb, the cigarette is gone and it was freshly lit so he wouldn't have thrown it on the ground, and when he goes to comb his hair there is a clear shot of the hand without the comb and without the cigarette.
Contributed by: Michael DiMente
Watch the Guy with the Bass Guitar in the begining of the movie as he walks past the T-Birds. He is talking but his lips are not moving that is because they dubbed in the words after shooting the scene. I know this for a fact... Because it was me!