Continuity mistake: In the final shoot-out scene where Clint Eastwood kills 5 men in rapid succession, Clint crouches and exchanges gunfire with two deputies who are standing side-by-side. A blood stain suddenly appears on the abdomen of the younger deputy on the left, but there is no bullet hole, it does not coincide with any gunshot sound effect, and the deputy does not react to the wound. A moment later, as Clint continues firing, both deputies topple over backwards.
Continuity mistake: When Levoi and Crowhorse visit Grandpa for the first time note the white and black beaded belt on the table behind Grandpa. In the beginning it hangs at the edge just at the first black stripe. Just after Grandpa trades Levoi for his glasses and hands him the rock, the belt now hangs nearly to the second black stripe. After that cut the belt now hangs in its original position. (00:37:30 - 00:38:30)
Continuity mistake: After Moco and Azul finish their telephone conversation about how many of Moco's men Azul killed, Azul leaves, but one of Azul's men goes back to see Azul's women. In the background, there are posters of the Playboy bunny logo and a woman on a jetski. Ashe runs away from the lethal women, the posters are nowhere to be found next to the doorway. (00:43:15)