Ferdinand Schumann-Heink is in casting call lists playing "Cliff" in this movie. But that character was played by Sam Rice.
During the shootout with the Indians, a cowboy is shot and falls down, while another just to his rear shoots his rifle, drops it, and begins shooting with his pistol. This is shown twice at different times during the battle, from two different angles, first up close and then further away.
In the opening credits, Dick Foran is called "The Singing Cowboy," but that designation is omitted in his subsequent on-screen credit. There his character surname is "Tyler," but he is called "Taylor" throughout the movie. Similarly, 'Carlyle Moore Jr.' is listed as "Little Big Wolf" in the credits, but is called simply "Little Wolf" in the movie.