Factual error: When Glass saves the Indian girl from the Frenchmen the flintlock pistol he gets off the Frenchman fires multiple times without reload, as it does later while being chased by the Indians.
Factual error: The bed in the "Haberdashery" has a box spring under the mattress. Referring to a "History of Bedding": "By 1927...box springs with ticking covers were still new." Having one in this time and remote location would have been impossible.