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.
Padre Benito del Toro: It's not safe for you to be here.
Machete: I'm not looking for "safe."
Padre Benito del Toro: No, I mean it's not safe for me for you to be here!