Continuity mistake: Near the beginning when Lee Van Cleef looks at the the wanted poster on the ticket booth at Tucumcari (just after getting off the train), there are two extra zero's drawn onto the poster (as added by the villain). Van Cleef then takes this poster away with him, and slots it under the door of a hotel room on a later scene - notice that the additional zero's have since disappeared from the same poster. (00:06:30 - 00:09:20)
Wild, The Hunchback: Well well, if it isn't the smoker. Well... Remember me, amigo?
Col. Douglas Mortimer: M-Mm.
Wild, The Hunchback: 'Course you do. El Paso.
Col. Douglas Mortimer: It's a small world.
Wild, The Hunchback: Yes, and very, very bad. Now come on, you light another match.
Col. Douglas Mortimer: I generally smoke just after I eat. Why don't you come back in about ten minutes?
Wild, The Hunchback: Ten minutes you'll be smoking in hell. Get up!.