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The movie's copyright is 1959, but part of it was filmed in 1964 or later. When the private investigator gets Eric Zinthrop's address, he calls Jerry and tells him to get right on it. In the next scene, as he and another guy drive around in search of Zinthrop, they pass several 1961-64 Chevrolets. When they pull up to the Ambulance Entrance and Jerry gets out of the car, a white 1964 Chevy Impala is parked on the right side of the screen.
Susan Cabot'x character plays a woman who takes wasp "royal jelly enzyme" to stay younger. In real life, Cabot suffered from mental illness. She reportedly tried to treat it with human growth hormone, which her son took for dwarfism, but it may have exacerbated her illness. Her son later killed her, reportedly in self-defense after she attacked him during a mental breakdown.
Leo Gordon, credited with the screenplay, was married to Lynn Cartwright, who plays the receptionist.