Random Trivia For This Title:
- Fred Dalton Thompson turned down a key role
- The "diamonds" used for the scenes during the climax of the movie were actually Herkimer Diamonds borrowed from the Herkimer Diamond Mines of Middleville, New York. They are doubly-terminated (two-ended) quartz crystals that are found in only two places in the world. They were the only gems that would look enough like diamonds and be that large. The one that was thrown out of the balloon at the end of the movie was lost, and so could not be returned to Herkimer Diamond Mines.
- Dylan Walsh plays Dr. Peter Elliot, a primatologist who's returning a gorilla to the wild. The real [?] Peter Elliot is a gorilla choreographer and ape performer in many movies, including this one.
- Director Frank Marshall originally intended to use the computer work pioneered on Jurassic Park for the gorillas, but opted for models as the computers weren't capable of reproducing hair.
- The volcano is an actual active volcano called Volcan Arenal, in Costa Rica. Some shots where filmed at Volcan Irazu, an inactive volcano.
- Bruce Campbell auditioned for the role of Dr. Peter Elliot. He was given the small part of Charles Travis instead.
- Producer [?] Frank Yablans had been involved in this project since its inception. Michael Crichton had pitched his idea for a modern-day King Solomon's Mines to him, before he had even written the novel. Yablans liked the idea so much that, without Crichton's authorization, he sold the film rights to Twentieth Century Fox in 1979, a year before the book was published. The technology to create the apes was not available at the time, however, and the project never materialized. During the production of Jurassic Park, Crichton was impressed with the dinosaurs that [?] Stan Winston's studio had created. Producer Kathleen Kennedy (who produced both films) suggested using Winston again for the apes, and suggested the project itself to her husband, Frank Marshall, and Crichton agreed. This resulted in Yablans, Marshall and Kennedy collaborating on the film.
- Hugh Grant and Robin Wright both declined leading roles
- The part of the 727 pilot was played by musician and pop icon Jimmy Buffett.