10 Movie "Plot Holes" You're Getting Completely Wrong

The ending of Jurassic Park III is a happy and triumphant one: Billy survives his injuries, Paul and Amanda rescue their missing son Eric, and Dr. Grant is, once again, able to escape from a dinosaur-infested island.

But strangely, nobody seems bothered by the group of Pteranodons that flies past their helicopter, heading for the mainland. These are dangerous animals that are more than capable of killing humans, but Grant brushes them off by saying that they're "looking for new nesting grounds", and none of the subsequent Jurassic World sequels mention what happened after they escaped.

So... why did the franchise suddenly forget about this very important plot point, especially considering that dinosaurs roaming the mainland is shown to be a very big deal in both The Lost World, and the recent Jurassic World: Fallen Kingdom?

This hole actually has two explanations: one found within the movies, and one found within the marketing for 2015's Jurassic World. The latter appears on the website for Masrani Global - the fictional corporation that built Jurassic World - and states that Vic Hoskins (Vincent D'Onofrio) "was involved in overseeing the infamous flying reptile 'cleanup' operation over Canada in 2001", a reference to the escaped Pteranodons.

As for the dinosaurs that Hoskins may have missed, there's an oft-forgotten detail in the original movie that directly addresses the escaped dinos problem.

At one point, John Arnold (Samuel L. Jackson) describes "The Lysine Contingency", a protocol intended to stop dinosaurs surviving away from the island. Basically, every creature created for the park is built with a genetic fault that means they're unable to manufacture the amino acid lysine - instead, the park's scientists supply them with it. Without this crucial acid, the dinosaurs will "slip into a coma and die."

So, even if Hoskins didn't manage to eliminate every single Pteranodon, there's a strong chance that the leftovers would eventually die naturally.