Filming
- According to King Kong: The History of a Movie Icon, director John Guillermin, known to have had outbursts from time to time on the set, got into a public shouting match with executive producer Federico De Laurentiis (son of producer Dino De Laurentiis). After the incident, Dino De Laurentiis was reported to have threatened to fire Guillermin if he did not start treating the cast and crew better.
- On one of the nights of filming Kong's death at the World Trade Center, over 30,000 people showed up at the site to be extras for the scene. Although the crowd was well behaved, the Port Authority of New York & New Jersey (owner of the World Trade Center complex) became concerned that the weight of so many people would cause the plaza to collapse, and ordered the producers to shut down the filming. However, the film makers had already got the shot they wanted of the large crowd rushing toward Kong's body. They returned to the site days later to finish filming the scene, with a much smaller crowd of paid extras.
- According to King Kong: The History of a Movie Icon, Rick Baker, who designed the ape suit along with Carlo Rambaldi, was extremely disappointed in the final suit, which he felt wasn't at all convincing. He gives all the credit for its passable appearance to cinematographer Richard H. Kline.
- According to King Kong: The History of a Movie Icon, the only time that the collaboration of Rick Baker and Carlo Rambaldi went smoothly was during the design of the mechanical Kong mask. Baker's design and Rambaldi's cable work combined to give Kong's face a wide range of expression that was responsible for much of the film's emotional impact. Baker gave much of the credit for its effectiveness to Rambaldi and his mechanics.
- According to the Internet Movie Database, seven different masks were created by Carlo Rambaldi, and molded by Rick Baker to convey various emotions. Separate masks were necessary as there were too many cables and mechanics required for all the expressions to fit in one single mask. The masks were composed of a plastic skull over which were placed artificial muscle groups activated by cables which entered the costume through Kong's feet, with the outer latex skins molded by Baker placed over the top. The masks used hydraulics to provide movement, so much like the mechanical Kong and hands, the facial expressions were controlled by the team of operators working off-set with the control boards. To complete the look of a gorilla, Baker wore contact lenses so his eyes would resemble those of a gorilla.
- Carlo Rambaldi's mechanical Kong was 40 ft (12 m) tall and weighed 6½ tons. It cost $1.7 million, and is the largest mechanical creature ever built. Despite months of preparation, the final device proved to be impossible to operate convincingly, and is only seen in a series of brief shots totalling less than 15 seconds.
- The movie poster showing Kong and the New York City skyline painted on the side of a Times Square building existed for about twenty years after the movie's release.
- The Wall, which was constructed on MGM's Lot 2, was originally designed to be a stone structure, similar to the 1933 version. Director John Guillermin changed it to a wooden structure because it looked more primitive. It was 47 ft (14 m) tall and 500 ft (108 m) long; the total cost was $800,000.
- Producer Dino De Laurentiis first approached Roman Polanski to direct the picture.
- According to King Kong: The History of a Movie Icon, to film the scene where the Petrox Explorer finds Dwan in the life raft, Jessica Lange spent hours in a rubber raft in the freezing cold, drenched and wearing only a slinky black dress. Although Lange wasn't aware of it, there were sharks circling the raft the entire time. (Shooting of this scene took place in the channel between Los Angeles and Catalina Island during the last week in January 1976.)
- Some posters advertised it as "The most exciting original motion picture event of all time," although it was a remake. The poster's main image is also wrong, in that Kong is seen battling jet planes and not helicopters, as in the movie. This scene also takes place at night and not in daylight as depicted in the poster. King Kong is also shown straddling the two towers with one foot on each, though in the movie he was not that large and had to leap to reach the other tower.
- King Kong was voiced by an uncredited Peter Cullen. Cullen injured his throat and coughed blood after a recording session that took five to six hours.
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