Trivia: When the Tyrannosaurus Rex walks past the circular shaped waterfall, it lines up perfectly recreating the Jurassic Park movie logo.
Continuity mistake: When Masie walks into her room and slams the door, making some items fall off the shelf, the remaining items differ when Claire goes to open the door a few seconds later. (00:27:20)
Revealing mistake: When the truck stealing Blue's baby drives off just as Owen spots it, dirt tracks are visible in the fresh snow from previous takes. (00:28:10)
Continuity mistake: When Ellie is talking to the farm owner, her position in relation to the tractor changes from the closeup to the long shot. She ends up further away. (00:19:10)
Continuity mistake: When Owen wraps the rope around the tree stump, the position of the rope changes between shots. Note the gap between the ropes. (00:08:30)
Continuity mistake: When Owen latches on the parasaurolophus he stops it with a tree trunk. He loses grip on his rope, leaving just a small bit of rope. He then ties a longer piece around the trunk. (00:08:44)
Continuity mistake: When Ellie is caressing the baby dinosaur, she has both hands on it's face. When the shot changes one hand is now on the concrete barrier. (00:25:00)
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.