During firefights, the weapons of most of the characters change between cuts. For example, Guererro starts the fight with his special fantasy revolvers, but in the next scene, he holds two modern Magnum revolvers (either S & W or Colts). This happens in almost any shooting scene.
When Calathea shoots at Red on the street, she is shown from behind firing one shot from a double-barreled shotgun. One second later, she is shown from the front, holding a Winchester rifle and repeating it for another shot at Red.
After Satan brands Gurerro's chest, there are several shots while Gurerro is still bound to the chair where the brand is not visible.
Most of the small weapons used during the shooting scene did not exist at that time the movie is set; e.g., a Colt .38 Special Police Service weapon (on markets after the turn of the century) and several Magnum-type revolvers (S & W .357 Magnum) which did not exist before the 1960s. Very special are Guererro's revolvers, which are simply fantasy weapons: a three-barrel Colt Dragoon front mounted on a Le Mat rear end with the Le Mat nine-shot cylinder.