Factual error: The movie is set in 1882, however there is a scene where he meets Doc Brown with his DeLorean. Back to the Future Part III took place in 1885.
Factual error: When Albert escapes Clinch's gang on the train, a marking on the boxcar indicates that its roof was replaced on 10-24. 1824 was long before this type of rail car was built, and 1924 would be 42 years after the movie is set.