Other mistake: In the shot where the men are playing a game of baseball, if you look carefully in the background you will see that cars are driving down the highway. Considering that this movie was supposed to take place in the 1800's...
Old-timer: Any damn fool can get himself shot full of holes.
Cole Younger: It ain't hard gettin' shot. It's the gettin' back up.
Jesse James: I can't think of one, can you? I've searched back through the crannies of my mind. I can't think of one single honest man we ever robbed.
Frank James: 'Cause we robbed the robbers, that's why. Just the railroads, the banks, all the damned plughats.
Jesse James: Talk about givin' us amnesty. Hell, it's up to us to give amnesty to them.