When the Lone Ranger and Tonto are tied up at the bottom of a well, his fake mustache is black instead of brown in two shots.
When Belle Starr is leaning out of the stage coach during the stage show, the entire shot is flipped when she is seen the second time (to indicate the coach riding in a circle).
The audience of the Wild West Show is the same at the start of the story as it is at the end, which takes place at least a couple of days later.
When Tonto tells the Lone Ranger that Slade Foxworth is back, the shot changes from Tonto to the Ranger and back, but the background of the silver mine remains the same.