When Hugh O'Brian is first seen in this movie, he's bare-chested. When Cliff Robertson is first seen, he's bare-chested. When Ron Husmann is first seen, he's bare-chested.
If Don Julian's voice sounds familiar, the actor playing him, Carlos Montalbán is the brother of Ricardo Montalban.
Ruth Roman (December 1922), Hugh O'Brian (April 1923) and Cliff Robertson (September 1923) were all born within a nine-month period.