Other mistake: The Mexican newspaper that Michael Douglas is reading in the helicopter has a headline where all of the accents are missing. No newspaper, even a cheap one, would make such a typo error. (01:27:35)
Other mistake: In the dig your own grave scene, Manolo falls into his grave after being shot in the head. When the three of them go, you can see that Manolo's body is moving as he breathes. (01:47:30)
Other mistake: In the dig your own grave scene, as Manolo falls into his grave after being shot in the head,you can clearly see his arms go out to catch himself as he falls. (01:47:20)
Chosen answer: The upper classes in Spanish-speaking countries tend to be more of Spanish ancestry, decendants of the original conquistadores. As such, some consider themselves Spanish, distinct from the lower-class Mestizos.