In the end scene of Jurassic Park (1993), Dr. Alan Grant looked out the helicopter's window and looked at a flock of pelicans flying besides the helicopter. At the end of this film Dr. Alan Grant looked out of the plane's window and looked at a group of Pterodons flying beside the plane.
Mirroring the latest palaeontologic finds that were made at the time, feathers were added onto various parts of the Velociraptor males, most noticeably on the top of their head. More recent finds suggest that raptors were indeed covered in feathers, a fact most members of the general public still find hard to digest. However the type of feather they used in the movie is incorrect: real raptors had the same kind of feathers as modern birds, and these covered their entire body, save for the tip of their snout.
After the Spinosaurus' attack on the airplane, Grant asks Billy how he would classify the animal. Billy's first inclination is to say the dinosaur is a Suchomimus or Baryonyx, due to the large snout. This is a joke meant for many fans of the film who, when the new movie's logo was first revealed, said the exact same thing Billy did. Many long pages on the message boards of fan pages and the official page were dedicated to this debate.
Near the end of the movie, when the Spinosaurus attacks Amanda Kirby (Téa Leoni) in the water and tries to grab her, the actress admits that she was injured by accident during those scenes when its claws would scratch her. When Leoni returned home from work one night and her husband David Duchovny saw the various slashes on her back she received during filming, he asked "At what point in this movie do they whip you?"
According to an interview with William H. Macy, the actor said the film's animatronic Spinosaurus had a 1,000-horsepower motor and that creature could turn its head at twice the force of gravity, with the tip of its nose moving at a speed of more than 100 miles per hour.
When Ellie is talking to Grant she mentions getting a quote from Jack Horner for her book. Jack Horner is a paleontologist who was Michael Crichton's inspiration for the character of Alan Grant; he was also a consultant on all of the three "Jurassic Park" films.
Original scripts and storyboards had a Baryonyx as the main dinosaur instead of the Spinosaurus. Baryonyx is a close relative of the Spinosaurus and they looked basically the same. Baryonyx was a little smaller, and did not have the fin like the Spinosaurus did. Director Joe Johnston wanted a main dinosaur that would not be confused with the T-Rex. Though the Baryonyx would have been vastly different, the Spinosaurus had a bizarre look no other carnivore had.
The computer-controlled "rapid prototyper" portrayed in the film is real technology, able to mechanically sculpt parts and objects in three dimensions using computerized drawings and scanned information. The machine in the film uses Laminated Object Manufacturing (LOM). Using one thin layer of bond paper and resin at a time, it carves away the unwanted material as each layer is added, until all the cross-sections have been built up into a solid replica of the original. The carving action of each layer creates a great deal of shavings and dust during the process, which you can see when Billy lifts the lid up to remove the finished model.
Dr. Grant's brown truck with the Museum of the Rockies and Montanta State University logos on it is actually based on the vehicle that belongs to Dr. Jack Horner, paleontologist consultant on the Jurassic Park films as well as the man that the character of Grant is based on. It was a difficult and time consuming process to find an exact match of Dr. Horner's truck to be used in the movie.
A few of the action sequences are borrowed from left over ideas from the first two Jurassic Park films, some of which were in the original scripts and made it as far as being storyboarded before they were scrapped due to time and budget constraints. These scenes include the pteranodon and river boat sequences.
Trevor Morgan, who plays Eric Kirby, also played Scott Anspaugh on ER (1994). Scott Anspaugh was the son of Dr. Donald Anspaugh (John Aylward), who was Chief of Staff. In Jurassic Park III, he plays William H. Macy's son. William H. Macy played Dr. David Morganstern on ER, who was the Chief of Surgery.
Pterosaurs were included in the original "Jurassic Park" novel, and had been considered for both of the previous films, but these ideas were abandoned except for a brief scene at the end of The Lost World: Jurassic Park (1997). They are finally featured in this film, in a sequence that is largely based on the aviary subplot in the first novel.
This is the second Jurassic Park movie in which an actor from the television series, Miami Vice, gets eaten by a dinosaur. In the original Jurassic Park, it was Martin Ferrero, who played a recurring character named Izzy Moreno on Vice, as the lawyer who gets eaten by T-Rex. In JP:III, Miami Vice regular John Diehl plays the mercenary who gets devoured by Spinosaurus as the plane is trying to take off.