The song that Blackthorn sings when the two of them finally get a horse is the same song that Clint Eastwood sings in Ein Fressen für die Geier (1970) when he is drunk. See more

Goofs

A continuity error is that at the entrance to the mine, Butch Cassidy tricks Eduardo Apodaca into thinking he has unloaded Eduardo's revolver. A few minutes later, in the mine, he tells Eduardo that he only knew about the gun 10 minutes before; Eduardo checks the cylinder and finds that it is still loaded, Butch having tricked him with a handful of his own cartridges.However, when the pursuers show up a little later, Butch hands Eduardo his pistol, saying "All right, here's your revolver back," despite never having disarmed him in the first place (and thus winning Eduardo's trust). See more