What makes me smirk watching movies is when they are shooting with smokeless powder before it was invented or using cartridge guns before there time . I try to educate my wife about this stuff but she tells me to shut up and just watch the movie . One more . When the calvary troopers are using Winchester lever guns instead of trapdoors or spencers . A few did have lever guns but not many . Got to go my wife told me to shut up !!!