Trivia: When Dr. Flaherty is painting on the beach, his tranquillity is broken by the nearby launch of a military weapon test. The film seen of the launch is stock footage of a U.S. built, back-engineered copy of the V-1 buzzbomb, one of the cutting edge weapons used by the Nazis during World War 2.
Trivia: In some instances in the film, such as when Gorobei kills the bandit who was checking the water level with an arrow, the actors were actually shot with real arrows. The actor would simply wear a block of wood under his costume (which you can see if you know what to look for) and an expert archer would actually shoot him.
Trivia: Marilyn Monroe suffered a torn ankle ligament August 13th when she fell into the river during filming. She was rescued by Mitchum and a dozen crew members, and had a limp for several days.
Trivia: William Alland who produced The Creature From The Black Lagoon, acted in Citizen Kane as the reporter who investigates Kane's career. During the filming Alland met Mexican cinematographer Gabriel Figueroa Mateos, who told him a legend of an amphibious creature who comes out of the River Amazon to seize women. Alland wrote a story based on the legend, which would form the basis of this 1954 horror film.
