WARNING: The following article contains spoilers for Jurassic World: Fallen Kingdom, in theaters now.
Jurassic World: Fallen Kingdom certainly achieved what it set out to do: alter the status quo of the franchise and chart new territory, away from the vision of the original trilogy. Those films were all about dinosaurs escaping and ruling the park, a premise on which 2015's Jurassic World hinged on as well, but now it's an entirely different landscape, with the creatures no longer captive.
However, to get to that point, director J.A. Bayona and writers Colin Trevorrow and Derek Connolly first had to make some twists and turns, which included a few retcons of Steven Spielberg's 1993 original. Fallen Kingdom takes some shortcuts along the way, resulting in some glaring plot holes that conveniently enable dinosaurs to again roam the American continent.
The Mosasaurus' Appetite
In Fallen Kingdom's opening sequence, some mercenaries enter Isla Nublar, now overrun and decommissioned, and move through the waterway to extract the Indominus Rex bones for Dr. Henry Wu (B.D. Wong). As you'll recall, that hybrid was eaten by the mosasaurus at the end of Jurassic World, so these black-ops operatives now have to get the bones from in its aquatic tank. However, as the mercs gather the material using submersibles, strangely enough, the mosasaurus doesn't attack.
It's obvious the creature is stalking the humans underwater, yet it never makes a move -- at least until they escape by helicopter, and it rises out the water to eat one of them dangling from a ladder. The mosasaurus has been seen to eat anything and everything in range, from sharks to fellow dinosaurs, so this was a moment of convenience to advance the plot and allow the leviathan to escape into the ocean.
Boiling Water Doesn't Burn ... Apparently
In the first act, Owen Grady (Chris Pratt), Claire Dearing (Bryce Dallas Howard) and Franklin Webb (Justice Webb) are part of the team tricked into rescuing the dinosaurs from Isla Nublar. Eli Mills (Rafe Spall) stages the mission so he can auction off the creatures, and when he gets what he wants, he leaves the humans to die on the island with the remaining animals as the volcano erupts.
To avoid the flow of molten lava, everyone, and everything, jumps into the ocean. However, while they avoid certain death that awaited them on land, the lava pours into the ocean, which, as science dictates, boils the surrounding water. The people should be experiencing scalding temperatures, even as the lava quickly cools, but they swim through water without so much as a blister.