- Ricou Browning, a professional diver and swimmer, was required to hold his breath for up to 4 minutes at a time for his underwater role as the "Gill Man." The director's logic was that the air would have to travel through the monster's gills and thus not reveal air bubbles from his mouth or nose. Thus, the costume was designed without an air tank. In the subsequent films, this detail was ignored and air can be seen emanating from the top of the creature's head.
- In this film, the eyes of the Creature were a fixed part of the rubber construction of the suit. The actors who played the part of the "Gill Man" could barely see, if at all. In the second film, the eyes have been, somewhat ludicrously, replaced with large, bulbous fish-eyes to assist in the actor's vision.
- Jenny Clack (University of Cambridge) discovered a fossil amphibian, found in the remnants of what was once a fetid swamp and named it Eucritta melanolimnetes - literally "the creature from the black lagoon".
- When William Alland was a member of Orson Welles' Mercury Theatre, he heard famed Mexican cinematographer 'Gabriel Figueroa' tell of a legend about a humanoid creature that supposedly lived in South America. That legend became the origin of this film.
- The Creature, using the name "Uncle Gilbert", appeared in an episode of the TV series _"Munsters The" (1964)_ The episode is titled "Love Comes to Mockingbird Heights."
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