Revealing mistake: Inside Jurassic World's main control room, Chris Pratt looks at a view screen depicting a paramilitary team tracking down the escaped I-Rex. In an homage to the film Aliens, the screen is complete with POV cam footage and heart rate monitors. Unfortunately, the FX team didn't catch the fact that all four people are shown having identical heart rates. Ridley Scott made the same mistake in Prometheus. (00:44:00)
Revealing mistake: When Owen and a lot of ACU soldiers shoot the pteradons, the soldier is shooting while his finger is in the safe position of his rifle. (01:22:10)
Revealing mistake: When Owen rescues a worker from the raptor paddock, having three raptors in front of him, the shadows of Owen and the raptors are in different directions. (00:24:40)
Revealing mistake: When the two boys crawl out of the water onto the dirt bank after jumping from the cliff to escape the Indominus Rex, the ground beneath them moves as if there is some sort of carpet beneath the muddy ground. (01:00:55)
Answer: Chances are either the gates were left open after the Pterosaur attack to allow visitors to escape quickly, or Hoskins had left them open earlier and forgot to close them to try and justify using the raptors as weapons.