Revealing mistake: When the Dilophosaurus spits at Nedry, you can see the smoke from the gun used to shoot the spit in his face, top left of screen. (01:10:50)
Audio problem: During lunch, when Malcolm says, 'And now you're selling, you wanna sell it,' the short quickly cuts to Gennaro. In it, Malcolm's lips are still moving after he's finished speaking. (00:34:25)
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. (01:05:30)
Continuity mistake: Hammond pours champagne into his glass and it's full of foam. After Grant says his line, when Hammond says, "...for the next three years." the foam is all gone. Foam from champagne takes longer to disappear. (00:12:25)
Continuity mistake: In the opening scene, when Jophery falls from the cage, he lands on his front. The shot changes to a wide view and he is now on his back and rolls over to get up. (00:02:40)
Continuity mistake: When we first meet the dinosaurs Alan is sitting in front of a lake. Ellie is standing right in front of him. After the cut Ellie comes to Alan from behind and puts her hands on his shoulders. (00:21:25)
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). (00:59:00)
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. (01:46:05)
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. (00:39:30)
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. (01:35:00)
Revealing mistake: When the baby dino is hatching you can see light from a hole below the egg. This allowed them to push the fake dino through the fake egg shell.
Revealing mistake: In the sequence when Lex almost falls from the hole in the ceiling, she looks straight back up at the camera. Rather than cut away from the stunt double at this point, they actually bothered to CGI the actress' face over the top so they could use the sequence right through. Unfortunately you can tell what's been done. (01:51:40)
Continuity mistake: When the T-rex breaks out, on the first car, the one with the kids in it, only the regular headlights are on. When it goes over the "cliff" all the headlights are on. (01:03:20 - 01:09:10)
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. (01:02:50)
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 don't fit at all. (01:51:30)
Continuity mistake: 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. (01:10:05)
Continuity mistake: After being electrocuted, Tim flies down vertically, but Dr. Grant catches him horizontally. (01:39:15)
Revealing mistake: When Dr. Malcolm gets thrown through the toilet door by the T-Rex, it is most obviously a stuntman that lands on the ground and gets covered in palm leaves. (01:04:40)
Factual error: Near the beginning, at the "Montana Badlands" dig site of Drs Grant and Sattler, a large shrub identifiable in several shots is creosotebush, a warm-desert plant that doesn't grow anywhere near Montana. Could this be California? (00:08:00)
Deliberate mistake: When the raptor breaks into the control room and is hopping around the computer workstations, we see sharp, distinct genetic coding projected from a computer screen and across the raptor's face (starting 1:55:50). Aside from the fact that computer displays have never projected focused images onto nearby surfaces, the projected text shown in this scene oddly reads from left-to-right, when it should actually be a flipped mirror-image (right-to-left). Spielberg probably realised this factual incongruity while filming but chose to use the left-to-right text for the sake of audience recognition, given that the multiple lines of "GATC" genetic code were already confusing enough. (01:55:50)
Chosen answer: Yes. The first opening day of Disneyland in California was catastrophic. The pavement was fresh and the sun was so hot high-heeled shoes actually sunk into the walkways. Counterfeit tickets were made, resulting in more people than the park had room for. They ran out of food and drinks. Bathrooms clogged and shut down. Many of the rides broke down on opening day. The Storybook Land Canal Boats had to be pulled by cast members in rubber boots. At the time, there were no guide rails for Autopia; some of the cars crashed into each other, making them inoperable. A gas leak in Fantasyland lead to the land being temporarily closed for part of the day.
David Yard