Not filmed in Arizona/Sonora
It would have been so easy to film in the true locations of Louis L'Amour's original story: Tucson, Arizona, southern Arizona and Sonora, Mexico.
Gotta say, I am not a fan of so-called "westerns," filmed in obviously foreign countries. Anyone who knows even a slight bit of geology or ecology can see that everything is so wrong about the locations.
I am a fan of Louis L'Amour, though; I might buy the DVD anyway.