As Captain Whitmore walks down the street in the opening sequence, the direction of his shadow changes from behind him and to his right to in front of him and to his left.
Several times as the posse rides through the desert, the saguaro cacti props in the background can be seen jiggling and flapping their arms in the wind.
After one rider is injured and taken back home, there are 13 riders shown at sunset riding across a ridge. In the next scene, there are only 11 shown at their camp, as well as at the Apache camp shortly after.
Although the rifles used were correct for the time period,several scenes show the actors shooting a single shot percussion rifle without cocking it,also firing several shots without reloading.
When Joshua Everette leaves the gang to seek medical help for his broken shoulder, he can be seen using his arm normally. He is supposedly dying of a broken arm, perhaps from infection or something, but as he leaves he shifts his reins with the bad arm and then uses the reins in the bad arm to whip his horse.