When Matt hits Beard, he starts to swing with his right hand, but when the camera changes, it's his left hand that backhands Beard.
When Beard shoots Hager in the Long Branch saloon, Hager doesn't actually pull the gun from his holster and you can see it in the Holster as turns and falls on his back against a chair. The camera moves to Beard then fades out. When it fades back in, Dillon is looking at the body and the gun is in his right hand and he is face down on the floor.
The first name "Jessie", used for one of the male characters, is not necessarily a misspelling of "Jesse", which is the usual spelling for a male. Although "Jessie" is now the preferred spelling for a female, either spelling was acceptable in the late 1800s.
At the beginning, a Hollywood wind storm appears. Everything is blowing around in front of the camera and around the couple that were riding to dodge. Nothing beyond them is moving.