Factual error: The girls stop at a grave site, and the marker indicates the husband had died 3 years earlier, in 1888. Yet, later on, Cody tells Frank that they're going to the "Oregon Territory". Oregon had been a state for over 30 years by that time.
Factual error: The end of the film sees the girls heading north to search for gold in the Klondike. One problem though- the film is set in 1891, and gold in the Klondike was not discovered until 1896.