Factual error: The deer in the forest somehow does not hear the giant dinosaur approaching, so doesn't run away. (01:21:10)
Factual error: As the C-119 cargo plane is going down over the Bio-Syn reservoir, the right wing snaps off, separating completely from the aircraft. As a result of upward lift forces pushing upward on the left wing no longer being countered by an equal lift force from the right wing, the aircraft would roll very quickly to the right. However, after the right wing separates, and just before the scene cuts away, the C-119 dips to the left.
Answer: The live dinosaurs are genetically tweaked recreations, they're not the "pure" dinosaurs of the past, which would still be of great interest. Plus just like any other archaeology or historical study, there's always more to be learned about the past, and a great many people are interested in what the past has to teach us.