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Factual error: The movie depicts General Sibley's New Mexico campaign. This occurred in the first half of 1862, with the last battle occurring on June 1, prior to a Confederate retreat to Texas. General Sibley is seen, and he lost his battlefield command altogether in 1863. However, Angel Eyes makes reference to Andersonville prison, which did not open until 1864. The question is also begged as to how Arch Stanton, who died in February of 1862, had completely rotted away by May in dry soil.

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Continuity mistake: A dirty Union cavalry officer hits himself to clean off the dust that made him appeared Confederate. His first two strikes barely shake the dust on his uniform, yet, after a cutaway and two off-screen strikes, his arm is almost completely free of dust. (01:16:50)

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Factual error: The judges reading Tuco and Shorty's death sentences mention them being wanted by so many counties within "the state." This cannot be correct. The battles the characters are near at all times in the film depict the battles over New Mexico. The Union never invaded Texas through its western deserts, despite landing in the Rio Grande valley. New Mexico was not a state until 1912 and was never treated as a state by the CSA. Thus, the judges should be saying territory.

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