The woman who plays Frances Fryer's date for the Ft. Scully ball is also seen in the chorus line for the Adelaid Adams finale in Chicago and then again with the group of ladies catching the wedding bouquets at the end of the movie.
The city of Deadwood in South Dakota is more than 900 miles from Chicago and yet various characters have no difficulty in traveling between the two cities from time to time. There were no cars or planes at the time and on horseback or coach would have taken at least a month. The person who wrote this must have missed the part where Calamity was on the train and also the the comment on the way back that 'The last 90 miles is by stage'. So it would have taken maybe a week for the round trip.
When the Indians attack the coach, Calamity is seen firing over the leather suitcase. There is a dark spot on the side of the case just below her chin. A second later an arrow hits the spot, apparently following a wire that was edited out.
When Francis Fryer is really getting into his number ("I've Got A Hive Full of Honey"), he drops his handkerchief while backing up to the trombonist. A quick cut and the chiffon hankie is back in his hand. He didn't stop to pick it up off the floor.
In the close-up shot of Calamity suspended by the rope from the saloon ceiling, it is obvious that the rope is holding steady quite some way off the vertical. A wire is visible suspended to the seat of her trousers.