Factual error: When John Wayne and Geraldine Page first meet the lead cavalry man and 'Buffalo Baker', you can see in the distance a radio tower on top of the hill/mountain.
Suggested correction: It's not a radio tower. It leans to one side and also the line goes almost to the creek bed. When the troops come back after getting ambushed it's not in the picture anymore.
I'm currently watching the movie and I noticed the radio tower in the background. There are no wires and the tower was not leaning.
Suggested correction: It isn't a tower at all, it's a flaw in the film. As the scene continues, at one point you can see it kind of shake or move a little. It's just a line or flaw on the film itself, it's not a radio tower or anything in the background.
Factual error: After they bury Jack's father, the stage driver hands Jack what he refers to as a "Navy" Colt. However, in 1841, the only colt handguns were a handful of Paterson revolvers, usually carried by Texas Rangers, and in fact, the revolver handed to the boy was a cartridge weapon.