In the brief shot of the train traveling at night, it is not the same train as in other scenes.
When Link and Trout arrive at Lasso, their shadows are to the right of screen, indicating mid-morning. As they get to the bank, their shadows are nearly under them, indicating the sun nearly directly overhead or a time of around noon. The shadows are in the same place when Trout flees from the bank. However, when Trout reaches the edge of town and dies, the shadows are again to the right of screen and are in the same direction when Link finds him, and when Claude and Ponch arrive in town.
When the "Man of the West" is waiting for his train and when he finally boards this train, near the beginning of the film, the cloud patterns in the sky change significantly in that short time.
Right after Link gets off the train, there is an interior shot and it appears to be quite dark outside the windows. It then cuts to a scene outside and it is daylight.
In the final shootout between hero Gary Cooper and bad guys John Dehner and Robert J. Wilke, Cooper fires at least nine bullets from his six-shooter before reloading.
When the gang reaches Lassoo they have only two saddle horses which Link and Trout ride into town with. Claude and Ponch later ride in to town to meet them riding two more saddle horses which they didn't have with them.
When the train stops for wood, it would also have to take on water, but it stops a ways past the water tower - out of reach of the "spigot arm" of the tower.
Signs in the town indicate that it is Del Rio, yet the railway station bears a sign for the fictional town of crosscut.
Cooper rides with his legs stretched forward, which makes it difficult to control a horse.
The town names of Crosscut and Sawmill clearly are references to the timber industry. No loggable forests are seen in the film.
During the train ride, modern power lines are sometimes seen outside the windows, most noticeably a yellow plastic covering for a pole support wire.
Coley has belt loops on his trousers but belt loops were not invented until 1922.
Miss Ellis is wearing nail polish but that was not invented until 1920.
Signs in the town indicate that it is Del Rio. Del Rio is just east of the border with Mexico, which extends thirty miles to the northwest of there. Jones says he comes from a town named Good Hope, which is supposedly located four days west of there. Later he says he comes from a settlement five days west named Sawmill. It is unlikely that any towns with English names would be located in Chihuahua, Mexico. Clearly, the existence of the Del Rio sign was an oversight. "Crosscut" is obviously located elsewhere.
Within a day's ride the landscape changes from grass-covered rolling hills to an arid, canyon-filled landscape.
Link and Claude are supposed to be cousins who grew up together and it is obvious that Gary Cooper and John Dehner are nowhere near the same age.
Link Jones gives the lawman in Crosscut a fake name Henry Wright. He tells different people he is from two different places Good Hope and Sawmill.
Early in the film, when Beasley, Billie Ellis, and Link Jones are left behind by the train after the robbery attempt, they stand on the railroad tracks debating what to do next. As they do so, the shadow of the boom mic is visible above their own shadows on the ground behind them. The time of day is nearing sunset, and the shadows of each character are also seen. A few seconds later, there are no shadows at all.