Final film of director Frank Tuttle, perhaps best remembered for his two Alan Ladd films from 1942: This Gun for Hire (1942) (the film that made Ladd a star, along with Veronica Lake) and Lucky Jordan (1942). Tuttle had been blacklisted in 1947 after being labeled a communist and had subsequently had difficulty finding work. Ladd most likely hired him as a way to repay him for the film 17 years earlier.
Diane Jergens' character was 16 years old. In real life, she was already 24 years old when the movie was nationally released in the United States.
In many markets Warner Brothers booked this at the bottom of a double feature with the Steve Reeves blockbuster Hercules (1958).
Dr. Lujan made a reference to the atomic bomb being dropped on Hiroshima (Japan) "15 years ago." With that said, the movie's story must be set in 1960 as the bomb was dropped in August 1945, just days before Japan's WWII surrender.
Dr. Paul Lujan is identified as having worked on the atomic bomb program at the "California Institute" (ostensibly the California Institute of Technology, known commonly as CalTech). In reality, while CalTech did contribute to the Manhattan Project, their involvement consisted of building detonators for the bombs. The work dealing with enrichment of uranium, Lujan's specialty, was done at Oak Ridge, Tennessee.