Factual error: A character in the episode has invented denim, but denim was invented in 1873 and was being used widely up to the time period of the series, which is set in 1893.
Character mistake: Trivette hands the man in yellow a bullet recovered from the plane Walker and Alex were traveling on, which was shot down by an assassin flying a P-51 Mustang. This man, and later Trivette, mistakenly refer to the round as a "50mm," when in reality, Mustangs were equipped with M2 Browning .50 Caliber (12.7 mm) machine guns. (00:30:25)
Visible crew/equipment: Matthew is talking to Hank in the saloon about Hank's horse that Brian wants. After Hank agrees to let Brian work for him to pay for the horse, Matthew walks out of the saloon. The camera pans to the left slightly and a microphone can be seen moving behind Hanks head. (00:32:30)
Suggested correction: The entire series was set in an alternate history of sorts, so most, if not all, historical "inaccuracies" cannot be regarded as mistakes.
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