Harrison Ford was the original choice to play Dr. Grant, but the producers decided to cast the relatively unknown (and much cheaper) Sam Neill in order to free up more money for special effects. See more...
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Jurassic Park (1993) - 144 mistakes
Revealing: In the shot immediately following Ellie turning on the circuit breakers when the raptor attacks her, we see a light bulb touching its head. There is smoke appearing where the bulb is in contact with the raptors head, the power has been off for a while the bulb would not be that hot after being on for just a few seconds.
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).
Revealing: In the kitchen 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.
Continuity: 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.
Continuity: Right before Lex and Tim scream when the T-Rex roars at them Lex is holding a flashlight, in the first shot you can see that Lex is staying completely still with the flashlight facing towards the driver seat but in the next shot you can see that it is pointing out the passenger side window.
Continuity: When the T-rex is attacking the vehicle with the kids inside, Alan gets out of the other car. Even though it is pouring rain and Alan is standing perfectly still, no raindrops are seen hitting his solid, medium-colored shirt. It stays perfectly dry, even though there is nothing overhead that is shielding him from the rain. It is only after the scene cuts to him at the other car that the shirt is suddenly drenched. The rain is obviously CGI.
Deliberate "mistake": At the end of the kitchen scene with the kids and the raptors, one of the raptors chases Tim as he runs to the door. As its doing this, Tim is running away with a bad limp, then as the raptor gains speed and is close behind, Tim's legs are perfectly fine as he sprints out the door and shuts it.