Factual error: The movie takes place in the early 1850's, referencing the rumor of gold in California. The girl, while rummaging through the wagon, comes across a pair of boots with zippers up the sides, zippers that wouldn't be invented for another 50 years.
Factual error: When the lone ranger fires his guns at the train he shoots over 20 times, despite using a 6 shooter. Likewise when Fuller is shooting at Tonto through the roof. (02:06:55 - 02:07:30)