Revealing mistake: When Buck comes across the first of two bodies in the desert, we see only the dead man's booted legs protruding from the bushes. When he finds the second body, the exact same shot of legs and boots (with the same bushes and rocks) is used over again with the film reversed.
Factual error: The Apache spearhead Buck appropriates is very obviously made from machine-tooled steel. Indian tribes in 1870s Arizona made their weapons points from hand-knapped stone and on rare occasions, iron. They never developed steel-making technology.
