DeForest Kelley rather famously told an anecdote about the filming of this movie in his later years on the Star Trek convention circuit, about the time Princess Sofia of Greece was visiting the set and Kelley flubbed a scene by falling over a chair onto his backside and saying "Oh, shit," in front of the princess. Henry Fonda told him the following Monday not to worry about it because he had danced with the princess over the weekend and ascertained that she had no idea what "shit" meant. This did not stop Kelley from getting a standing ovation at the commissary when the cast and crew broke for lunch.
Two important roles were played by actors going very much against type. The often strong, tough, macho Anthony Quinn here is cast as a hesitant, even weak man. Tom Drake, who once played sensitive composer Richard Rodgers and while at MGM specialized in nice, clean-cut "boy next door" roles, here is cast as the chief villain, the evil boss of the vicious "San Pablo" gang.
Henry Fonda's name in the original US version is definitely "Clay," but some other sources refer to him as "Curt." Perhaps some foreign versions of the film renamed him because "Clay" as a first name was unfamiliar there, while "Curt" was.
Richard Widmark and Henry Fonda appeared in five movies together, the others being " How the West was Won ", " Madigan " " Rollercoaster "and " The Swarm ". They were both married to the same woman, the socialite Susan Blanchard.
Blaisedell's salary was very high for the time at $400/month. On the TV series Lawman (1958) for example, Marshall Troop's salary was $60/month. $400 circa 1880 is equivalent to about $9,000 in 2017 dollars.
Henry Fonda would go on in 1973 to play gunfighter Jack Beauregard, a gunfighter with a reputation for cleaning up crime in the spaghetti western comedy My Name Is Nobody (1973) (English title My Name is Nobody).