Other mistake: When Cheech and Chong are crossing the street talking about Cheech's uncle, two buses are coming. When the second bus passes by the camera, a kid on the bus waves his hand to the camera. (00:38:15)
Other mistake: The suit jackets that Buddy and JP Richardson were wearing at the last concert had to have been sewn incorrectly, especially the sleeves. The seam at the top of the sleeve caused bunching all the way down the sleeve. Buddy's jacket looked like it was buttoned incorrectly at the top, but it was probably also a sewing mishap and poor fitting. So, the way the jackets were sewn was one big mistake (or wardrobe malfunction). (01:40:44)