Revealing mistake: When Grant and the children are up in the tree, as Tim is telling his jokes the camera pans out and we get a wider view. In this shot you can see that Grant's boots are spotlessly clean, which is highly unlikely given the muddy ground, wet environment and his activities over the past few hours.
Continuity mistake: When the T-Rex first breaks out of her paddock, she walks between the two Explorers which look to be only a short distance apart- maybe one or two T-Rex-steps between them. But later when the T-Rex is by Grant's Explorer and walks to the one with the kids in it (when Grant is saying "Turn the light off") she has to take about five steps to get there.
Audio problem: In the scene at the end when they're in the ceiling then the raptor hits the roof top so it breaks and Lex almost fell to the ground. Well she's always screaming but look closely at the very moment when she falls, her lips doesn't fit at all.
Visible crew/equipment: When Hammond and Muldoon enter the control room with the weather report look to the right of the door. The dark camera is visible in the reflection and it moves away as they walk by.
Visible crew/equipment: When Tim is following Grant before they start the vehicle tour,Tim sits in the first car.Look to the right of the door frame and you will see a dark shadow get larger.This is obviously the camera.When Grant finally shuts the door the large shadow is even more visible.
Revealing mistake: 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 mistake: When Hammond watches the vehicles leaving the visitor center the first car is passed the main steps. In the next shot of the car, they are just moving past the steps.
Continuity mistake: 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 mistake: In the scene just after the T-Rex snorts Dr Grant's hat off you can see him and Lex with their backs almost right against the overturned Ford Explorer. The T-Rex then butts upside down vehicle causing it to spin, only now, they have nearly a 3 foot head start.
Continuity mistake: When Sam Neill found the eggshells beside the root of the tree, they are on the dark soil. In the other shot, the same eggshells are on the clear sand.
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!"
Continuity mistake: When the T-Rex has come and nearly destroyed the car, Grant is trying to get Tim and Lex out of the car. Lex then screams and this causes Grant to turn around and cover her mouth. They are sitting on one side of a tyre on the car when Grant has his hat on. In the next shot (when the T-Rex has blown Grant's hat off) they are on the other side of the tyre.
Revealing mistake: When Ellie runs from the Raptor the stunt double who runs for her has on a wig that looks nothing like her real hair. It just looks very fake.
Continuity mistake: In the T-Rex attack, once the car has flipped and the T-Rex is turning it round, it pushes it a full 180 degrees to end up beside the wall, then next shot and the T-Rex pushes it more to end up in the same place.
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.
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.
Visible crew/equipment: When Lex & Tim are hiding from the two raptors in the kitchen, a ladle (a soup spoon) by Tim's head falls to the floor and attracts the attention of the raptors. If you watch the top of the ladle right before it falls, from the right you can clearly see the shadow of the device that causes it to turn and fall.
Continuity mistake: When the explorers break down outside the T-Rex paddock, Grant can be seen filling a flask with rainwater out of the door. When the angle changes the door is closed, then the angle changes again and he is still collecting rainwater with the door open (fixed in the VHS Widescreen and "Ultimate Collection" DVD box set versions).