At roughly the 86-minute mark, the famous Wilhelm Scream can be heard when a cowboy is struck with a tomahawk.
The scenes of the Indians crossing a river and attacking is footage taken from L'indiana bianca (1953).
Virginia Mayo (Celia Gray) starred in Orizzonti lontani (1957) the year before, also directed by Gordon Douglas.
A couple of the movie posters show Clint Walker with two holsters and pistols. At no point in the movie does he wear a holster and pistol on his left side.