Revealing: 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.

Continuity: In the command center, when Arnold turns all the power off, the main system VDU powers down when the 'C-1' switch is thrown (then the main 'Power' switch is turned off). However, the main system VDU comes on again when the main switch is powered on.

Continuity: When the dinosaur comes up to Allen and the kids in the tree, we see various footage of the dinosaur's head, but in those shots there is a much larger amount of foliage around and on the tree than there was before.

Revealing: When Grant tells Lex and Tim about the breeding he then gestures to the dinosaurs' footprints. Some of the footprints are very square in shape and have obviously been stamped in the ground.

Continuity: Just after Gennaro suggests a coupon day at Lunch the camera goes to Hammond then back to Gennaro.In the change from Hammond back to Gennaro,Malcolm's head changes directions from facing left to right.

Continuity: Hammond has a pronounced Scottish accent at the start of the film, which deteriorates markedly in just a couple of scenes. By the end of the film he has an upper class English accent.

Continuity: 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!"

Continuity: In the scene when Dennis tries to get the dinosaur to fetch a stick,at first the stick is perfectly straight. Then they show a shot of Dennis from the front, and all of a sudden the stick is crooked.

Revealing: During the external shot of Nedry getting attacked by the dilophosaurus, there is a clear reflection of stage lights near the jeep's front left wheel.

Audio problem: In the kitchen scene, the instant the first velociraptor hops up onto the counters, it knocks off a large metal pot. There is no sound of it hitting the ground.

Audio problem: When the T-Rex is looking at the kids in the Explorer and suddenly makes her screaming sound, the kids jump and put their hands over their ears. But if you watch Tim, he doesn't make any reaction to the noise for about two seconds, then jumps like it just started.

Factual error: In the early scene where Dennis Nedry meets a man to plan the embryo theft, the subtitle says that they are in San Jose, Costa Rica. However, the sleepy coastal town in the movie bears no resemblance to the real San Jose (a cosmopolitan capital of almost 1 million people, situated 50 miles from either coast).

Continuity: 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.

Visible crew/equipment: In the scene where 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.

Continuity: When Nedry is trying out the shaving foam can, he puts some on his right hand. When the camera pans back after he's wiped most of it off on the pie, his hand is suddenly completely clean. He then pretends to wipe it off with a napkin anyway.

Revealing: 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.

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.

Continuity: In the scene where Hammond is sitting at the long table and eating ice cream, Ellie comes in and sits at the opposite end. All of the ice cream barrels are near him. When a scene cuts to Ellie, there is an ice cream container near her and towards the end of the scene she gets some ice cream. At the end of the scene, the shot shows both of them and the table and there is no ice cream within Ellie's reach.

Continuity: When the TRex proves to be a no show, the windows of the Ford Explorers are clear. When Jeff Goldblum moves away from his window, the window is spotted with rain drops.

Continuity: When everyone arrives at the park, they get out of the helicopter in an order which is in sharp contrast to the seating arrangement while they were flying.