Originally, the film included Jeff Goldblum and his character, Ian Malcolm. But a few days into filming, Goldblum injured his leg and decided to drop out, stating that his character wasn't that important to the script.
The Spinosaurus was the largest animatronic ever built. It weighed 12 tons and was operated by hydraulics. This allowed it to operate while completely submerged in water.
Although not based on a book like the first two films, previously unfilmed scenes from the first two novels do appear in this movie.