You can clearly see a stand-in for Cheyenne in bar fight where he is fighting Turk who also is using a double.
Cheyenne hits a basket on desk when he takes off gun belt to get arrested. Murchison sets rifle on same desk but basket is back in place.
When Cheyenne jumps off the balcony after a gun battle, he is obviously replaced by stand-in. You can still see him as he runs across the street to check on Bill.
When saloon manager Gannon opens his roll-top desk and picks up two handguns, one of them is a single-action revolver and the other is a semiautomatic pistol. The slide and ejection port were visible. The pistol appeared to be a 1911 government model semiautomatic pistol which would have been way before its time.
At 28:10, you can see the shadow of a boom microphone to the left of Cheyenne's head on a lamp.