Just like the makers of "King Kong," Spielberg changed the face of the moviemaking industry forever. The seamless mix of incredible CGI and elaborate animatronics is what makes "Jurassic Park" such a wonder to behold, even decades later. Spielberg pays loving homage to "King Kong" in his own version of a monster epic. This kind of computer-generated work had never been seen before. Beyond Jurassic Park was a disc included with the Jurassic Park Trilogy DVD box set that was released on December 11th, 2001. The beautifully-detailed animatronics can be seen throughout the film, including the mammoth 40-foot long tyrannosaurus rex. But the dinosaurs made with go-motion still needed to look more fluid, so Spielberg looked at a CGI concept sequence that Industrial Light & Magic animators Mark Dippé and Steve Williams secretly made of a tyrannosaurus rex chasing a herd of gallimimus. In the end, Spielberg brought in special effects master Stan Winston to create the animatronic dinosaurs and Phil Tippett to use go-motion, a variation of stop-motion. The same way Willis O'Brien made King Kong."
Spielberg initially planned to use stop-motion in "Jurassic Park." In the behind the scenes feature " Return to Jurassic Park: Dawn of a New Era," the director explained where he got his inspiration: "How we were going to get the dinosaurs to run, how we were going to get them to even be in the movie in wide shots, was always going to be the old-fashioned way through stop motion animation. You can hike the Waikoko Forest Management Road (which is approximately 12.8 kilometers/8 miles long) to walk right to the spot where Jurassic Park was almost opened to the world. Traveling mattes were also employed, combining foreground action with a separately filmed background, which is especially important for all of the scenes where humans and Skull Island creatures interact. The gates have since been removed but there are two poles that were left standing to mark the famous entrance. In addition to stop-motion, the effects team used models and miniature rear projection.
King Kong himself was an 18-inch puppet, and the special effects team built giant arms, hands, and feet for various shots, as well as a large head operated by cables and levers to manipulate his facial features for close-ups. The famous fight between Kong and the Tyrannosaurus rex took seven weeks to finish, according to Inverse. Stop-motion was a painstaking process that required meticulous lighting and set-up in order to make movements seem as fluid and consistent as possible. Schoedsack used special effects for "King Kong" in a way that had never been seen before during the 1930s. The monsters on Skull Island came alive from the use of stop-motion animation by Willis O'Brien.