The white guitar Ginger has in the "Bidin' My Time" number doesn't appear to have any strings in some shots.
During the intro of Fascinating Rhythm, Dorsey's clarinet player is seen to be playing a trill during his solo, yet no trill is heard.
When Ginger arrives at the college and sees Danny get put onto a horse by some of the students to ride off to a campfire, there seems to be a trainer squatted behind an abandoned carriage cuing the horses.