----
!!For the film:
* BigLippedAlligatorMoment: The blackface scene comes out of nowhere, was filmed probably ten years beforehand by an entirely different crew, and adds nothing to the plot.
* HeyItsThatGuy:
** Timothy Farrell, who plays Vic Brady, had played gangster Umberto Scalli in three loosely-connected films: ''The Devil's Sleep'' (1949), ''Film/RacketGirls'' (1951), and ''Dance Hall Racket'' (1953). Acting was a part time job for him. His day job was serving as a bailiff for the Los Angeles Marshal's Department. He eventually rose through the ranks and served as County Marshal from 1971 to 1975.
** Dolores Fuller, who plays Marilyn Gregor, had started her career as a child actor with a small role in ''Film/ItHappenedOneNight'' (1934). She had larger roles in ''Film/GlenOrGlenda'' (1953) and ''Mesa of Lost Women'' (1953).
** Mona [=McKinnon=], who played Miss Willis, is better known for playing Paula Trent, the female lead in Film/Plan9FromOuterSpace.
** Bud Osborne, who played Paul [=McKenna=], was a 40-years veteran of [[IndexOfFilmWesterns Film Westerns]].
** Herbert Rawlinson, who plays Dr. Boris Gregor, had a lengthy career, starting from 1910s [[SilentMovie Silent Films]] and lasting to his death. This was his final role, dying from lung cancer before the release of the film.
** Steve Reeves, who plays Lt. Bob Lawrence, went on to star in the film ''Film/{{Hercules}}'' (1958) and its sequel ''Hercules Unchained'' (1959).
** Lyle Talbot, who plays Inspector Johns, portrayed SelfDemonstrating/LexLuthor in ''Atom Man vs. Superman'' (1950).
** Theodora Thurman, who plays Loretta, was a fashion model. She is better known as "Miss Monitor", the sexy WeatherReport girl for the NBC Radio program from 1955 to 1961. She reportedly "became the most recognizable female voice in the country" by turning on viewers by voice alone.
* WhatCouldHaveBeen: The role of Dr. Boris Gregor was reportedly written for Creator/BelaLugosi.