- The last time 'McQueen, Steve' was billed as "Steven".
- The monster is referred to as "the mass" in the shooting script.
- Partially filmed in Phoenixville, Pennsylvania. The theater everyone is seen running from is the Colonial Theater.
- The movie being shown at the Colonial Theatre was "Daughter of Horror", originally released as Dementia (1955).
- The Colonial Theatre sequence shows a poster for a film titled "The Vampire and the Robot". Although this was one of the proposed U.S. titles for Mother Riley Meets the Vampire (1952), the movie is a phoney. It is a doctored poster for Forbidden Planet (1956)
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