
Continuity mistake: When Dieter Stark is about to taze the dinosaur, the guy with the long beard approaches him, telling him what it is. As the bearded man says "They're presumed to be scavengers, like jackals", Stark's taser is closed mostly inwards. In the next shot, the taser is suddenly extended, opened out.
Answer: The dinosaurs on Isla Nublar are not mentioned. In the first book they are destroyed by bombing, which makes the second island more surprising - a lost world.