Shot the Head off a Snake - S1-E5
Factual error: Frank Griffin makes a reference to Burma Shave in the 1880s. Burma Shave didn't appear until 1925.
Godless (2017)
1 factual error in season 1 - chronological order
Starring: Michelle Dockery, Scoot McNairy, Jack O'Connell, Merritt Wever
Factual error: Roy has a letter from his brother Jim who has apparently made a home in Atascadero Ca, however it wasn't established until 1913.