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: The Marines that arrive at the landing site are said to be from El Toro, but El Toro was a Marine Corps Air Station; it would not have had the infantry, artillery, and armored units that arrive at the site.
Factual error: If we are to assume that the British cruisers were Dido class with 5.25" guns, the assertion that the Essen would outrange them by 5000 yards is pretty much true. However, in order for the Brits to launch torpedoes, they would have had to close to inside of 20K yards, well within range of their main guns. Thus said, if the British cruisers were any of their 6 inch gun class, there would have been no advantage in range.