Continuity mistake: At the end of the scene with the sick Triceratops, just after Dr. Harding says, "I'm in a gas powered jeep", Dr. Malcolm's hands move from on his hips to on his chest, whilst Dr. Grant's hands move from behind his back to in front of him in the next shot. (00:51:40)
Continuity mistake: We see Dr. Grant helping Tim out of the car that has just fallen into the tree, then suddenly, they are about 5 feet under the car though the dialogue and split second cut suggest that they had merely just gotten out of the car and had not yet began their descent. (01:13:40)Aaron Lassman
Deliberate mistake: In the scene where the T-Rex is chasing the Explorer, there is a shot of the driver's side side view mirror which says, "Objects in mirror are closer than they appear." This warning is only used on convex mirrors, which are only placed on the passenger side of cars. (01:17:40)
Continuity mistake: When Timmy hears the T-Rex stomping and takes off the night vision goggles, his hair in back comes up. In the next shot, his hair is down again. (00:59:15)
Continuity mistake: When the group are at the velociraptor paddock Hammond says "And that's why we're taking extreme precautions". Dr. Malcolm's head changes from looking sideways to being tilted down a lot more. Also Hammond starts to turn and then turns again in the following shot. (00:31:50)
Factual error: The way the car "slides" down the tree as Grant and Tim are climbing down is very unrealistic. Rather than hugging the trunk like it does, the branches (some of which are thick enough) would deflect it away from the trunk. (01:13:30 - 01:15:00)
Continuity mistake: As the T-Rex is looking for Lex and Dr. Grant, Dr. Grant says "Don't move. He can't see us if you don't move." When he says this he is to the left of the wheel arch. Then, the T-Rex blows the hat off Dr. Grant who, with Lex is at the end of the upturned 4x4 when the T-Rex knocks it but in the next shot they have moved and are not at the end of the 4x4. They are back where they started, to the left of the wheel. (01:05:30)Ssiscool
Revealing mistake: The T-rex does not leave or make any footprints in the soft mud during the attack on the car.
Continuity mistake: When Muldoon and Hammond are talking about the tropical storm the first time we see a shot of Nedry's workstation behind them and there's hardly anything on the floor, but a few minutes later when Hammond says their lives are in Nedry's hands suddenly the floor is covered in trash.
Revealing mistake: During the whole scene of the T-Rex attacking the Explorers you see an illumination that moves from place to place. Sometimes the illumination is in the deep woods, and then it is behind the dinosaur when it is next to the vehicle. When the T-Rex first walks up and sniffs Tim and Lex's Explorer you can even see the light to the left of Rex's head. Since the power is out, no lights are on except the vehicle headlights and they aren't making that much light. Also, there is no moonlight since it is pouring with rain. (00:58:00 - 01:07:00)
Revealing mistake: When Alan and Tim climb down the tree to escape from the falling car, you can see cables along the bark of the tree below the car as it falls. (01:14:20)