The breakout.
The JW film breakout didn't work for me. The main protaganists should seem as smart or smarter than I am at all times. She lives on her cell, but physically goes back to control center? Dude enters the pen before confirmation to get an even better look at claw marks? For most of the crises it was just the one rex lumbering along. They did a good job of having it come out of nowhere, but it's still enormous.
Everything is going along, routine, then bam, then rise of the Jurassic. Every kind of predatory dino crawls and jumps out of it's cage.
How? there's the old standby, hubris of believing they have a perfect security system that malfunctions, there're earthquake, tsunami, volcano....
How 'bout all of the above? A meteor strike, Yucatan style, off the coast of the island. Dormant volcano is triggered, fault line is shaken, tsunami comes in and floods everything with aquatic creatures getting everywhere, most systems fail....