Factual error: In this poorly-researched film ("based on a true story"), Tom Horn lugs around a government-issue, lever-action 45.60 caliber rifle and even claims that he prefers the 45.60 because the ammunition is plentiful wherever he goes. However, there is no historical or biographical record of Tom Horn carrying and using a 45.60 rifle. In point of fact, the real Tom Horn's weapon of choice was the lever-action 30.30 rifle (a common range weapon of the day, often known as a "brushbuster"). When Tom Horn was arrested for murder in real life, he was carrying his 30.30 rifle, but a 45.60 cartridge was discovered in his pocket. This film fabricated its fictional plot around that 45.60 cartridge found in his possession.
Factual error: There appears to be a pickup truck parked by a barn in the background when Steve McQueen is standing by his horse, talking to Linda Evans. (00:19:00 - 00:20:00)
