Goofs: Revealing mistakes: In the cave, when the Gill Man lifts David over his head, the wires lifting David into the air are faintly visible, then can be seen snapping loose as the Gill Man lowers him back to the ground.
(more) Trivia: 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.
(more) Filming Locations: Backlot, Universal Studios - 100 Universal City Plaza, Universal City, California, USA
(more) Quotes: Lucas: There are many strange legends in the Amazon. Even I, Lucas, have heard the legend of a man-fish.
(more)