During the final confrontation with Dude, Stretch's shirt changes color.
When Lengthy enters the saloon to confront Richard Widmark, he takes his cowboy boots off outside the saloon and then enters. As he is dying, he can be seen wearing his boots.....
At the spring when Stretch (Gregory Peck) kicks Lengthy (John Russell) hard in the face with the heel of his boot and then punches him in the face, there are no cuts or bruises to be seen on Lengthy's face afterward.
The ricochet bullet hits Grandpa in the inner side of his left knee, yet when his daughter is attending to the wound in the house under the blanket, she appears to be working lower near the outer side of his left calf or shin.
Just before beginning to cross the salt flats after the bank robbery, Dude pulls his saddle stirrup out to jump into it, but misses. The scene cuts immediately to another view, showing him successfully mounting the horse.
When the gang gets into Yellow Sky after crossing the desert, they are nearly dead of thirst. When they go to the spring, the horses show no interest in the water.
Story is set in 1867, according to the opening scene, yet all handguns in the movie are 1873 Colt Peacemakers.
At the beginning of the film when the gang robs the bank, as they ride out of town they are seen and heard firing their guns numerous times. In the immediate next scene, as they are riding toward the camera, a puff of pistol smoke is seen rising in the air from a rider whose arm is held toward the sky. However, unlike all the shots in the town, no sound is heard.