Audio problem: When Cheech and Chong are out eating, Chong says "I'm still hungry, you wanna order another one?", but his lips aren't moving. (00:16:00)
Continuity mistake: When Cheech gets off the stage in the beginning of the final show, you can see the spotlights on him when he is walking towards the curtains. When it cuts to a wide shot Cheech is gone and the spotlight is off. (01:04:25)