Factual error: When Cruz is schooling Jaunito about "Quetzalcoatl" in the background the song "Low Rider" is playing. The timeline states it's 1972, but the song wasn't released until 1975. (00:08:10)
Revealing mistake: When Cruz, Miklo, and Paco take out the customer's car cruising they pass a Olds Cutlass and Chrysler Cordoba on the street that are newer than 1972. (00:11:00)
Visible crew/equipment: In the prison scene where Popeye is showing Miklo around the part where it's said "Beto Suige lol" the boom mic shows as soon as Beto gets up. (00:45:13)
Continuity mistake: During most of the movie, Miklo has these incredibly blue contacts on. However, in some scenes (also closeups!) his eyes are the actor's natural grayish-green color.
Revealing mistake: In prison where Magic Mike and Miklo are talking, Miklo leans over to whisper something to Magic. If you look at Miklo's shoulders, you can see his singlet tan that he must have gotten while shooting the scenes in the beginning, but that part was at least 5 years before.
Continuity mistake: Spider's pose changes between shots when he falls down the hill and dies.
Continuity mistake: During Paco's undercover drug bust, the PCP dealer Carmen is smoking a cigar. She looks down before taking the cigar out of her mouth. In the next shot, she is still looking up.
Continuity mistake: During the infamous "chon chon" scene, Miklo blocks Popeye's attack with a mattress. When they fall over, the mattress disappears.
Continuity mistake: At the end of the film when Paco realises that he is the reason why Cruz became an addict and Miklos went to jail, Cruz is looking at him but has his face turned away in the next shot.
Factual error: Rick Berry retired from the NBA in 1980. He would not have been a factor in any NBA game played after 1980. This comes up in the scene where Miklo is talking to his boss about a bet on an NBA game after 1980.
Answer: Extended part.