Joan Crawford's adopted daughter Christina, still on speaking terms with her mother, was asked to attend the movie's premiere in Joan's place. Afterwards, Christina says she got a call from Joan Crawford asking her what she thought of the picture. "What could I tell her about this...it was the absolute worst piece of junk...so I told her it must have been a grueling picture to be on, working with all the stuffed animals...and she hung up on me."
After seeing this film, Joan Crawford supposedly joked that if it hadn't been for her end-of-life conversion to Christian Science, she might have committed suicide due to her embarrassment at having been in it.
John Hamill, who plays the second spelunker to strip to his undershorts during the opening cave sequence, was used to this kind of exposure. In the late 1960s he ranked as one of England's top "physique" models.
At this low point in her career, Joan Crawford was rumored to have been lacing her multiple glasses of "Pepsi" each day with liberal amounts of vodka, which helps explain how she kept a straight face while making as trashy a film as this.