During the grand finale in the courtyard, when Ross Logan is shooting it out with Carranza's gang of killers, the length of the barrel of Logan's revolver changes. One minute he is wielding a six-gun that has a shorter barrel while at another point he is shown handling a revolver with a longer barrel.
At 10 minutes in, the gringo shoots five oncoming bad guys with his rifle. They all fall back from being shot, but at least three are "killed" before their fatal rounds were fired.