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: When Hondo is introduced to the young cavalry lieutenant, Buffalo Baker remarks that it is 1870. Later, when the survivors return to the ranch, they claim to have killed Victorio; however, Victorio was actually killed in 1880 in Mexico, by Mexican troops.
Suggested correction: They are talking about when "Victorio" the Indian chief dies. In the movie though the Indian chief is "Vittorio" he is a fictional character. So you can't compare his death to the real Victorio.
When Mrs. Lowe sees Vitoria for first time he says his name is Victorio.