Continuity mistake: At the San-Diego docks, the guy says it's the 'wee small hours of the morning', yet when he goes inside the Harbour Master's control room, the clock on the wall says 9:25. (01:38:20)
Factual error: When Roland is walking in the pouring rain and talking about killing the T-Rex, he has his gun slung over his shoulder vertically and barrel-upwards. If you were to do this in real-life in a tropical rainstorm for very long, you would run the risk of water entering the barrel and causing problems with the gun. And as a professional hunter Roland would know better. (01:07:50)
Continuity mistake: When Jeff Goldblum is trapped in the car with the raptor outside, the raptor bumps into the window, cracking it. There's no hole in the centre of the crack in the shot of the raptor, but when we see a shot of Jeff Goldblum a second later, there's suddenly a hole in the window. (01:30:05)
Continuity mistake: When the English family arrives at the island, the sky is a bit gray. When the little girl wanders off, it is suddenly a sunny, beautiful day. (00:02:05)
Visible crew/equipment: In the scene where Ian is speaking to Mr. Ludlow while the group is walking through the rain. If you watch in the background when Ian says the word "Long" something falls from the top of the screen. An extra even follows the item as it falls, you can see his head move. Hard to miss. (01:11:30)
Revealing mistake: In the beginning of the movie, when the rescue group arrived on Isla Sorna, the actress grabs the Nikon F5 of the photographer and makes her way to the nest of the Stegosaurus. After several shots of the small Stegosaurus there is no more film left in the cassette, so the camera begins to rewind it automatically. The thing is, you never see the rewind knob moving although you hear the camera's motor rewinding (The Nikon F5 has a manual rewind knob to be able to rewind the film when the batteries are dead). There was obviously no film at all in the camera. (00:26:00)
Revealing mistake: When Kelly does her acrobatics and kicks the raptor out through the window it is possible to see that the raptor is pulled through the window as it "flies" upward and scrapes against the top of the window frame and then straight down. As the raptor falls down 2 wires can be seen reflecting light outside of the window, one even falls down after the raptor.
Revealing mistake: When the T-rex escapes into San Diego, it enters someone's backyard to drink from their pool. When the Rex plunges its face into the water, the water barely ripples and its bottom jaw is as clear as day below the surface of the water. If a beast of that size were to dip its head in the water, no matter how gently, it would've created a ripple that would distort the surface of the water quite significantly. (01:45:20)
Continuity mistake: When Sarah walks through the water when she sees Malcolm for the first time on the island her pants are soaked up to mid thigh, in the next scene she is running through the water again and her pants are only soaked up to her knees. (00:24:15)
Factual error: When the first half of the trailer is hanging over the cliff, the second half is pulled towards the edge. But the pull from the first half would be going downwards - in a 90-degree angle to the position of the first half. That would not pull the second half outwards, but more lift the end up. (00:59:35)
Continuity mistake: When Ian starts to walk out of Dr. Hammond's office, we see an empty hallway. A shot or two later, there is a butler standing to the left of a lamp in the middle of the hallway. Then another shot or two later, the butler is standing to the left of the hallway where we can't see him. (00:13:50)
Factual error: In the last scene of the movie it shows the adult Tyrannosaurs and the baby. Then it shows a Pterosaur. If you put on subtitles it says [Pterodactyl shrieking.]. Those couldn't be Pterodactyls, since Pterodactyls were much shorter and had no crest. Those Pterosaurs are in fact Pteranodons.
Continuity mistake: After Malcolm and his team are rescued at the edge of the cliff by the Hunter and his team, the "movable feast" begin their journey to the abandoned site. As the music plays and the trek commences you might notice that the footage shot in Hawaii has the Hunter's hat off. This is intercut with the footage shot in California with the Hunter's hat on. It can get distracting.
Continuity mistake: At the very beginning, when you see the English family on the beach, the little girl wanders off and you then see a shot of her on her own. However, she must have walked a pretty long way because the beach she is on is definitely not the beach that her parents were on; the rocks in the ocean are gone and the waves are smaller. (00:02:00)
Continuity mistake: When Rowland and the other man spot the baby T-rex, it is eating its meal. Then it looks up at them. Then it cuts to another shot where Rowland and the other man are talking. If you look in the background you can see the baby with his head down eating again. Then it cuts back to where the baby is. It is looking up at them again. (00:39:30)