When Warren begins shooting Bob, a massive blood spurt is shown each time he shoots him. Each time he is shot, the blood spurts don't line up with the area where Warren shoots at. The first time Warren shoots Bob, the gun is showing firing at his stomach, but the blood is shown spurting from his chest and the second time he shoots Bob, the gun is fired at the top of his chest, but the blood spurts come from a couple of inches below where he was shot.
The guitar that Domergue plays and that was subsequently destroyed by Ruth was a priceless antique from the 1870's on loan from the Martin Guitar Museum. Six replicas were made for the film, however Kurt Russell wasn't correctly informed and destroyed the original. Due to this the Martin Guitar Museum said they would never lend an instrument to film shoots ever again.