Audio problem: Near the end of the film, when the Commodores finally go on stage with their equipment, Bobby Speed announces them from inside the control booth. But the movement of his mouth does not match the audio (you have to look at his reflection in the glass wall).
Audio problem: When Cheech and Chong are being questioned by the officer at the border, the officer says "you got any narcotics, any marijuana in here?". His lips continue moving but we can't hear him. (00:45:45)