The small pistol Carla has is called a pepperbox (or pepperpot). Each barrel is loaded individually and has to be manually rotated to be fired. These types of guns were invented in the 1830s and predate the modern revolver by just a few years.
This film was a mild success at the box office, earning MGM a profit of $104,000 (about $1.2M in 2023) according to studio records. It brought in about $110,000 more outside of North American that it did in the USA and Canada - a financial rarity for the time.
This was planned to be filmed in 3D, but was eventually filmed in 2D, the first feature to employ spherical Panavision lenses.
Richard Anderson was wounded in his shoulder and leg during the "arrow rain" scene.
During the first ambush scene, one of the Native Americans throws a tomahawk directly over the camera.