Continuity mistake: When Cheech is turning over his car to pick up Chong you see him starting to turn over before he reach Chong. When it cuts Cheech has passed Chong before turning over. (00:07:40)
Continuity mistake: When Cheech stops to pick up Chong, the driver's window is down. A moment later, it's up.
Continuity mistake: When Chong's father is shouting "we're not gonna have a family brawl," there is a big bottle of juice on the edge of the table by Chong. It cuts away for three seconds and then back to Chong. The bottle of juice has moved to the middle of the table. Also, Chong has poured juice into the mixture. He wouldn't have had time to do all that in just three seconds. (00:01:35)
Continuity mistake: When Cheech asks Chong if he is driving ok you can see a lot of smoke inside of the car. When it cuts all the smoke is gone. (00:13:35)
Continuity mistake: When Cheech pulls down his cap in front of his eyes and shouts "I'm blind" you can see some cars stop beside them. When it cuts the cars are gone. (00:17:30)
Continuity mistake: When Cheech says "He's right man, these are lame" to Curtis, one of the band members is standing behind Curtis. When it cuts to a closeup of Curtis, the guy is gone. (00:21:25)
Continuity mistake: When the band is done playing, sparks shoot out of Cheech's guitar and the guitar is burning. When it cuts, the guitar isn't burning anymore, then it is burning again. (01:17:35)
Continuity mistake: When Chong is walking by his father you see him carrying some items in his hand. When it cuts he is carrying the items in another way. (00:02:20)
Continuity mistake: When Cheech and Chong come into the courtroom, the judge takes off her glasses and holds them. When it cuts, she isn't holding them anymore. (00:18:30)
Continuity mistake: When Cheech and Chong have parked the car and Cheech asks "Am I driving OK?", Chong is holding the joint. When it cuts, the joint is gone. (00:13:35)
Continuity mistake: In the beginning when the kid is crawling on Cheech, you see Cheech putting him on the floor head first. When it cuts he is putting the kid on his feet. (00:00:35)
Continuity mistake: When Cheech is getting off the couch, you see him putting his foot on the floor just missing the bowl of cereal. When it cuts to a closeup, you see his foot going right into the bowl. (00:00:40)
Continuity mistake: After Cheech has asked the girls if they need a ride he spots Chong hitchhiking. He then takes a u-turn to the other side of the road. At this time you still see the girls sitting in their original position. When it cuts you suddenly see a van has appeared from out of nowhere and the girls are suddenly walking to it. (00:07:35)
Continuity mistake: After Chong fights with with his parents, he walks away and his mother is looking at him smiling. When it cuts, she is suddenly doing her toenails. (00:02:25)
Continuity mistake: Just before Cheech gets up from the couch, a girl is getting up from the floor. When Cheech is putting his foot into the bowl of cereal, you can see the girl's knee as she is still sitting on the floor. (00:00:40)
Continuity mistake: When Chong is on the phone with Cheech and about to go outside you can see a man in a white hat dancing by himself. When it cuts the same man is dancing with a woman. (00:31:00)
Continuity mistake: When Cheech picks up Chong in his car, Chong has some grass in his beard. The grass changes position between the shots. (00:08:20)
Continuity mistake: When Chong is trying to calm Cheech down in the car, Cheech is sitting with both hands up. When it cuts, his hands are down. (00:15:15)
Continuity mistake: When Cheech and Chong get to the courtroom, there are two pencils on their table. When Chong falls to the floor, no pencils are to be seen. (00:18:35)
Continuity mistake: When Cheech tells the cop that his name is Pedro de Pacas, Cheech is holding his wallet. When it cuts, the wallet is gone and he is holding the wheel instead. (00:17:05)
Answer: The lead singer is Rick Wilder. The band is credited as "Berlin Brats" (The Groups). The song is called "Psychotic", or sometimes listed as " (I'm) Psychotic", but it seems the middle part was cut out for the film or maybe arranged differently for the film.
Bishop73