These are more continuity mistakes, but I find them interesting.
In the newer "3:10 to Yuma", there are a number of mistakes. One of my favorites is when Charlie Prince is confronting the railroad workers in the tunnel ("Are you some kind of posse?"). The badge on one guy's lapel keeps changing sides (left lapel, right lapel, left lapel).
Charlie then draws his two Schofields and shoots two of the railroad guys by crossing his arms in front (right gun shooting the left guy, left gun shooting the right). The camera cuts to another angle and Charlie is holding his guns pointed out to his sides (right gun to the right, left to the left). There are more, but those are in the same scene. I just can't imagine how they could get the badge thing wrong, though. Do they keep unpinning the badge between takes? If they had to take it off, didn't they think about which side it was on?
CC Griff