- Joan Crawford's last film.
- The budget was so tight for this film that star Joan Crawford had to use her own car as a dressing room, and supply all of her own wardrobe minus the blue lab coat.
- Trog was orginally set to be made by Tigon pictures, from a script by Tigon owner Tony Tenser and Derek and Donald Ford.
- Trog's ratty ape-suit is a leftover monkey outfit from Kubrick's 2001.
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