Originally intended to be photographed in 3-D and to be titled "Man-Killer."
Average Shot Length = ~8 seconds. Median Shot Length = ~8.4 seconds.
Most movies back then didn't have the villain as the main (central) character (especially not a psychopath), but Sean McClory fits that bill here, although technically he's fourth billed in the credits. And the first two credited actors weren't actors, but were famous for other things: Clyde Beatty as a Circus Owner/Lion Tamer and Mickey Spillane an author, both playing themselves.
Final film of veteran director D. Ross Lederman (although he did not direct but served as Associate Producer).
Produced by John Wayne through his Wayne-Fellows production company. Wayne managed to persuade William A. Wellman to do over $100,000 worth of re-shoots for a percentage of the profits.