Midnight Decisions.

Velociraptors are social animals, with learned traits they didn't learn at the park. The park's raptors don't know how to work as a team or live in a pack, because they had no adults to teach them. That's why you have adult raptors keeping the juveniles away from the food, or attacking baby raptors.

The deterioration of the 2nd island's dinosaur population was due to a prion disease. Park organisers bought the cheapest feed (derived from scrapie infected sheep) without considering the consequences, and the populations were collapsing because a prion disease called DX had become endemic.

None of the people running the park understood the biology of the animals they were keeping. They were concerned with having a static, point-in-time population, not a functioning ecosystem. So when the dinosaurs started breeding, they had no idea what to do.

Similarly, they were more interested in the environments as dioramas for visitor viewing than as ecosystems for the animals. They kept predators isolated and tossed all the herbivores together ("it's not like they're gonna eat each other!") rather than studying their behavior to decide which dinosaurs to put where.

They picked plants based on the prehistoric aesthetic they wanted rather than their actual properties. Remember the sick triceratops? It was sick because it ate a poisonous plant. Ellie figured that out because her area of study was paleobotany. She also figured out that some of the plants around the family-friendly swimming pool were highly toxic. Nobody double checked the plants they used for their impacts on visitors or the dinosaurs.

They had hundreds of animals and no staff ecologists. They had 1 veterinarian. Instead of having paleontologists on staff, they had a big game hunter. All their biologists worked in the lab. They built everything like theme park rides because automation kept labor costs down and made secrecy easier.