Steve Brodie's moustache changes several times. One time it is solid all the way across, another time it has a 1/2" gap in the middle and sometimes it has a peak and other times it doesn't.
Logan is in the saloon office in a dark coloured jacket and trousers and a black ribbon-type tie . Moments later, he's in the street in light coloured trousers, a frock coat and a cravat.
Although the official credits and publicity for the movie state Masterson's middle name as Bartley, it was actually Barclay. Randolph Scott introduces himself correctly as William Barclay Masterson to Billy House's Carmody character when he initially enters town.
Although there was a drought in the area of Liberal, Kansas, located in Seward County, Kansas, Masterson was not a U.S. Marshal there. He was elected Sheriff of Ford County. He was elected in 1877 and subsequently voted out in 1879. His brother Ed Masterson, not Bat, was marshal of Dodge City.