Continuity mistake: When Machete mounts the minigun to the motorcycle in the big fight scene at the end of the movie, it's just the gun barrels and breech on a plate between the handlebars, with no ammo feed. When he's in midair and firing, there is a very visible ammo feed chute going into the side of the gun (as there should be). In the next frame, he lands and gets off the bike, and again it's only the gun/breech assembly, no ammo feed.
Factual error: In a very early scene, just as the young girl is pulling a cellphone out of her vagina, if you look closely you can see that the "cellphone" she is holding is actually an iPod Nano 5th generation, which does not make phone calls. (00:04:20)
Continuity mistake: During the fight in the Hospital, Machete stands before a Guy just watching him. In the next scene the police Officer gets shot. Back to the Scene with Machete still standing there watching the guy before cutting his belly. It's like Machete is standing watching this guy for 5 seconds without moving during a fast fight with more than 3 guys.
Other mistake: When Senator John McLaughlin is shooting immigrants crossing the boarder, there is only one of his henchmen who is filming with just one camera from one angle. Yet, when this material is shown on TV towards the end of the movie, there are cuts between two cameras from two different angles. The viewer's look (you) is reused as material captured by Mr. McLaughlin henchmen.Andreas Winnberg