She Wore a Yellow Ribbon (1949) - 5 mistakes

Character mistake: After running into Indians on his last patrol, Capt. Brittles orders Sgt. Tyree to head south and meet up with the (indicating singular) Paradise River Patrol. He is then to proceed at his best pace to meet up with Capt. Brittles at the stage station. Capt. Brittles states that he will approach the objective from the east. Sgt. Tyree is then shown riding off perpendicular to the unit's line of march. After a brief time lapse, the unit meets up with another patrol of soldiers that once again identifies itself as the Paradise River Patrol. This Paradise River Patrol joins up with the larger body of troops and continues toward the stage station. No sign of Sgt Tyree. Upon arriving at the stage station, Capt. Brittles meets up with Sgt. Tyree and another body of soldiers which is also identified as the Paradise River Patrol.

Plot hole: Immediately before the attack on Pony-That-Walks' village Capt. Brittles states that it's 12 minutes to midnight,and orders the attack. The attack is a surprise attack, yet all the warriors pile out of their tipi's fully clothed, painted and with their eagle feathers braided into their hair.

Factual error: In the very beginning of the movie, the narrator says, "Pony Express riders know that one more such attack (referring to the Custer Massacre) would mean a hundred years before another wagon train crosses the prairie." Then they show a Pony Express rider supposedly carrying the news. But the Custer massacre happened in June of 1876, and the Pony Express went out of business in 1861.

Audio problem: in the beginning of the movie there is a shot of the flag being raised over Fort Stark and the sound of a bugle is playing. The bugler is playing "Retreat" which is only played when the flag is coming down; he should be playing "Reveille".

Factual error: Near the end of the movie Capt. Brittles states that he's an officer of the U.S. Cavalry for four more hours, what he means is that his term expires at midnite that night , this would make the time 8:00 PM however when he makes this statement it is broad daylight.