Continuity mistake: In an early scene, Samuel L Jackson's character is struggling to get the computers up, and he is smoking away. A full cigarette, then half, then full, all without lighting a new smoke. (00:56:25)
Continuity mistake: The satchel of money Nedry receives as a down payment for getting the embryos off the island vanishes from his arms as he looks at the false container of shaving cream. It vanishes mid-sentence; he had no time to put it down. (00:14:00)
Continuity mistake: When the T. Rex escapes its paddock and then Tim tells Lex to turn the light off, in the interior shot after Tim closes the vehicle's door, the plastic piece (used for seat belts) anchored to the panel between the windows vanishes inexplicably leaving just a hole, and when the T. Rex roars Tim covers his ears and there's some kind of small plastic on that hole.
Continuity mistake: After Alan pulls Lex out from the overturned Explorer and the T. Rex spins the vehicle around, in the closeup shot from behind Tim while he's still inside the Explorer, as the T. Rex leans down facing Tim we can see one of the lower front teeth is missing, but it's back in the following shots.
Continuity mistake: In the Badlands scene, when Dr. Grant enters the trailer there is a large overhead shade blocking out direct sunlight. On the inside light is streaming through the windows. On top of that, the first window is larger when seen inside the trailer than it is when seen from the outside. (00:09:50)
Continuity mistake: When Tim, Lex and Dr. Grant are hiding in a large tree, a large dinosaur appears. They pull some branches off the tree and feed the dinosaur. However, when they first climb the tree, there is no foliage in the area at all. (01:19:20)
Continuity mistake: When the two kids are eating the food just before the raptors try to attack them, the little boy's hair is all messy and strands of it are sticking out. In the next scene, when the kids run into the kitchen and hide behind the counter, his hair is perfectly straight and combed. (01:43:30)
Continuity mistake: When Nedry opens the first gate, the big one that the explorers entered, the jeep he is driving has a long, thin antenna on it that is waving about, and is standing up straight. At the next gate, it is tied down, and looks semicircular. Nedry wouldn't have spent time tying it down since he had to get to the docks. (00:56:00)
Continuity mistake: During the opening sequence a couple shots show it raining where other shots have no rain and a dry environment. First noticed after Muldoon says "Jophery raise the gate" and when the gatekeeper falls off the transport box. (00:02:10 - 00:03:20)
Continuity mistake: When they first land on the island, the actors' positions change. In the interior shots, Satler is sitting to Hammond's left during the descent. When the copter door opens, Hammond is on the other side, his left side facing the door. They would not have switched places during the descent. (00:16:55 - 00:17:45)
Continuity mistake: When entering the visitor centre, Ian goes from the side of Hammond to the back of all the characters without a chance to move, in a single shot.
Continuity mistake: When Grant and Malcolm's car suddenly "just stops" you can see outside that they are in a thick dense jungle area. A few minutes later, the two parked cars are in a wide open area next to the T-Rex fence. (00:55:20 - 00:58:10)
Continuity mistake: In the opening scene Jophery is being attacked by the dinosaur in the cage and Muldoon is holding onto him while the workers shock the dinosaur. Muldoon's hat is on in one shot, then the camera cuts and it is off while the camera is dollying forward, then it is on again. This happens just as he is about to shout "SHOOT HER! SHOOT HER!" (00:03:00)
Continuity mistake: When Grant grabs onto the electric fence, his hands are a short distance apart and there is a set of vertically positioned wiring in between his hands - the warning sign is also barely covering the "hole" in the wires. A couple of shots later, without letting go of the fence, his hands are much further apart and there are now three sets of vertically positioned wiring in between his hands. The angle of the wires also changes, and the sign is now well into the "hole", very near his hand.
Continuity mistake: When they are on the dinosaur's bones, one of the cords attached to the section that Lex is on comes out. The bone starts to fall and (for a fraction of a second) you can see that Lex lets go of it but in the next shot she is hanging on again. (01:51:45)
Continuity mistake: When Nedry gets lost at night, he crashes into a mud bank on the front end of his Jeep. When we get a shot of Nedry getting out of the car, he looks to see what stopped him. The obstacle has changed to a log caught on the back tyres. No more mud bank. (01:08:05)
Continuity mistake: In the badlands segment of the film, after Ellie, Alan, and Hammond enter the trailer. Hammond decides to open the bottle of champagne that Ellie, and Allen were saving. Hammond begins to buff a couple of glasses with a towel that magically changes to a pink towel in the next shot. (00:10:45)