Continuity mistake: When the gang of bad guys ride to the ranch there are nine of them. When they leave, and throughout the rest of the movie there are only seven, despite only one being shot off his horse at the ranch. (00:15:15)
Continuity mistake: The dog changes from a regular color collie to a dark almost black collie several times throughout the movie.
Continuity mistake: As James is being hassled in the bar, one of the bad guys goes through the window into the hotel room. Sam shoots him and he falls backwards through the balcony railing. The next time the railing is shown, it's put back together.
Continuity mistake: There are four men in the third car when crossing the bridge. When going through the stream there are now five men, and when the ambush happens only three jump out, leaving one dead man to go over the cliff. (00:40:30)
Continuity mistake: When James goes to help up Michael after Jake punches him, they walk off to the horses without picking up Michael's rifle that was next to him on the ground. He somehow has it to use later on in killing the man in the bell tower. (00:50:50)
Other mistake: A shootout occurs in a hotel, where a shotgun blast apparently opens the money box. None of the perpetrators fired into the room.
Answer: According to Wikipedia, the shootout at the ranch, both Devries brothers are killed by Jeff McCandles, before being shot himself. The rest die at the end of the movie.
You only see the older brother shot by Jeffrey before being shot himself. I only assumed young Billy stayed behind to help his brother.