From The Grindhouse Cinema Database
- This was the only movie that the cast appeared in (excluding 'Paul Galloway', and one of the bit players who appeared in Silent Night, Deadly Night III: Better Watch Out! (1989) (V)), and the only movie for most of the crew as well.
- Filming the movie's monster was a bit of a tongue-in-cheek affair. For shots that wouldn't show the monsters feet, Wade Popwell, the actor in the monster suit, would usually be wearing shoes. So unless we're seeing the monsters feet in a shot - it would typically be wearing tennis shoes on location.
- In an interview with writer Ron Kivett he stated that the inspiration for the movie came from an article he read about a species of 'walking' catfish that could live both in water and on land. The article theorized that the fish were possibly a mutation and Kivett thought it was an intriguing idea for a story. Doctor Leopold refers to the same species of fish in his endless voice-over narrative in the movie.
- The movie was shot in 1971 and had a limited release in the American south that year, but it would be nearly four years before it saw any wide release.