Factual error: The distance from Lee's Ferry to Lordsburg is over 500 miles, not a trivial distance by stage coach. But in fact, the stagecoach travels several times through Monument Valley, back and forth. Monument Valley is on Navajo Reservation, nowhere near the Apaches or Geronimo.
Factual error: The film is set during the late 1880's in India. The rifles/bayonets carried by all the British soldiers and Thuggee Indians are American 1890's Krag-Jorgensen rifles. Presumably done for ease of supplying American ammunition compared to British .303 ammunition.