Revealing mistake: When the group stops to watch the Brachiosaurus, its CGI head clips through the branches of the tree, and the body becomes transparent. A close-up is provided, though it's not necessary at all when watching it on screen.
Suggested correction: There is no clipping. When his head is turned, its head is in front of the branches, and when he starts looking forward and goes on his hind legs, its head is behind the branches.
I don't see any superimposing. Its head is in front of the branch. It's even clearer in the moving scene, no superimposing to spot. Is this screenshot from the VHS version? Because if it's not visible there, it won't be in any other version either.
Revealing mistake: The two Ford Explorers have no connection to the electric track they run on. You can see this clearly in the scene where the group is getting into them, and then on the rear car when they pass through the oversized gates to enter Jurassic Park. (00:42:27)
Revealing mistake: In the scenes where there's a video link to the docks shown on computer, there's a bar moving along the bottom of the screen, showing us that it's actually a video that's just playing on the computer. (00:52:05)
Revealing mistake: While the T. Rex attacks Explorer 4, when Lex and Tim are holding the roof up with their hands and feet, in one of the interior closeups after the T. Rex has lost its tooth we can see the metal post jutting out from the dinosaur's gum, to which the fake tooth is attached in the animatronic's mouth.
Revealing mistake: When the Dilophosaurus opens its crest, you can see the strings pulling it open. This has been fixed on blu-ray.
Revealing mistake: When the T-Rex has a raptor in its mouth at the end, the raptor disappears completely from the T-Rex's mouth for one frame. It's just after it's picked up - the T-Rex swings it left, then right, and as it swings to its left again the raptor disappears. If you want to be even more precise, there's a slatted/stepped white bit above the door - the raptor disappears about 3 frames after its foot moves above that white bit. (01:52:20)
Revealing mistake: After the goat leg falls onto Explorer 4's roof, in the first shot of the T. Rex as she lifts her head to swallow the rest of the goat, when the camera tilts up the distinct outline of spray from the rain machine can be seen at the top of the screen.
Revealing mistake: After the T. Rex has flipped the Explorer upside down there's a closeup of Ian, and when it cuts to the T. Rex chomping away on the tire while the Explorer moves around, we can see that the acrylic glass roof is attached to the vehicle with thin cable wire - holes were drilled in the acrylic glass roof and sides of the vehicle.
Revealing mistake: When Nedry is attacked by the Dilophosaurus, (the spitting dinosaur), the first spit supposedly lands on his shirt, BUT if you look closely, Nedry slaps it there himself with his hand - there's only a little bit on his shirt before he hits himself, then there's loads. (01:10:40)
Revealing mistake: During the scene where Dr. Grant and the children are forced to climb a fence to flee from an unseen dino, there's a brief side view of the fence that clearly shows that it isn't continuous - it is probably only about 75 feet wide. (01:36:35)
Revealing mistake: While the T. Rex attacks the Explorer that Lex and Tim are in, during the stunt as the acrylic glass roof comes down on the kids in the interior shots, the strip of duct tape falls through the opening and dangles from the roof of the vehicle - presumably the tape was holding the acrylic glass roof in place before the stunt.
Revealing mistake: In the opening scene Jophery is being attacked by the velociraptor. As the camera pans along the outside of the cage, in between the flashes one can see his legs inside the cage and that nothing is actually attacking him. (00:03:05)
Revealing mistake: When the Explorers are entering the park through the large wooden gate, during the overhead angle you can see that the perimeter fence isn't continuous. (00:40:00)
Revealing mistake: When Tim is looking at the 2 cups of water vibrating due to the T-Rex's stomping, you can see a very small dark spot at the bottom of the cup, which is actually the knot of a guitar string that was plucked to create the vibration effect.
Revealing mistake: When the T-Rex flips the Explorer over, as it settles on its roof, the stunt control wires are visible at the rear of the vehicle. This mistake was corrected on blu-ray. (01:03:40)
Revealing mistake: When Lex and Tim are playing hide and seek with the Raptors in the kitchen, when the camera cuts to a wide shot of the Raptors walking in from a distance, the Raptor on the left looks directly at Tim while he crawls by, but then looks back in the direction it was going. (01:45:15)
Revealing mistake: When Grant is trying to save the two grandchildren in the over-turned Explorer, the T-Rex returns and surprises them. Grant holds the girl and tells her not to move. The Rex then starts smelling around and blows Grant's hat off. Well if you watch closely, you can see that the air that blows Grant's hat off doesn't come from the T-Rex, it comes from something under the Rex. (01:05:35)
Revealing mistake: When Tim is shocked off the fence as the power comes back on, the sparking effects are not where his hands are touching, instead the sparks are several inches away. (01:39:00)
Revealing mistake: When the T-rex is attacking the vehicle and he has turned it over, the camera pans round behind the T-rex and you see through its legs, the ground all around the base of the beast is dry, but it's been pouring with rain for a while. (01:05:45)
Revealing mistake: When Alan and Lex are holding on to the cable, fearful of the Explorer that is about to come tumbling down at them, you'll notice that the car, if it had been filmed at the same time the actors where there, would have cut off Sam Neill's leg. Lex grabbed the wire in time but Sam doesn't move his leg enough. (01:06:45)
