Despite the notorious financial and critical failure of the epic western Heaven's Gate (1980), within five years Hollywood had produced a slew of western. In 1985, in addition to this film, there were Silverado (1985), Pale Rider (1985) and Lust in the Dust (1985). ¡Three Amigos! (1986) followed in 1986.
After Rex shoots Bob Barber, Peter asks him how he feels about that. The audio has Rex saying "I missed his hand", but by reading his lips, he simply says "I don't know".
When Rex rescues the "Cattle Barons Daughter" from being dragged around by her horse, his gun belt starts falling off as he is running over to her. You can see it down by his knees.
When Rex O'Herlihan walks into town before the final showdown, you see Colonel Ticonderoga move his coat back behind his gun, making sure he has access to it, the next shot the coat is covering the gun.