The expedition that this film centers around, while containing fictional characters, is based on a real expedition ordered by President of Texas Mirabeau Lamar to annex New Mexico to the Republic of Texas in 1841. The use of black and white beans to decide who to execute and who to spare is borrowed the Mier expedition, which took place the following year. See more
Various characters are shown using large revolvers, possibly Walker Colts, or early model Colt's Dragoon models. These weren't introduced until 5-6 years after the story is set. See more
Me, I'll shoot myself in the head if I got time.
Well, that could go wrong, too. Don't be sticking no gun in your mouth unless it's a shotgun.
Why not? It's hard to miss your head with a gun in your mouth.
No, it ain't. That bullet could ricochet off a tooth... come out your ear. You'd be still healthy enough to torture for a week. You shove the butt of a gun against your eyeball... and pull. Now, that's sure. Then if some squaw comes along and chews your privates, you won't know the difference.