These are what we call the 'YMMV items.' Things that some people find in this work. We call them 'your mileage might vary' because not everyone sees these things in the same way. This starts discussions in the trope lists, a thing we don't want. Please use the discussion page if you'd like to discuss any of these items.
Adaptation Displacement: The films overshadow the novel, though not as badly as some other cases. This is, in part, because of Adaptation Distillation. By this point, the film franchise has a longer and much different continuity than Michael Crichton created in the books. In fact, Crichton never intended for Jurassic Park to become a franchise when he published the original book in 1990.
Alternative Character Interpretation: In the book, Hammond is at best a Jerkass who is visionary but otherwise really just wants people's money; in the movie, he's presented as a kindly old man who just wants to share the magic of dinosaurs, but some elements of Jerkassery remain: He bribes Grant and Sattler to come to the park and write a favourable opinion (after someone was killed), and underestimating Nedry's greed is what prompted the latter's sabotage.
We aren't told nearly enough about Nedry to know if his beef with Hammond is legitimate in the film; judging from their discussion, it seems that Hammond pays Nedry more than enough and Nedry considers his work worth unreasonable amounts — note his smarmy 'thanks Dad' comment after Hammond tells him that his financial problems are his problems. Also, he doesn't bribe Ellie and Alan — he offers to fund their dig for several more years regardless of their opinion of the park, and whilst he is seeking their positive opinion, it's never said he doesn't feel grief over the worker's death in the opening sequence — the favourable opinions from Ellie and Alan would merely placate the board of directors at InGen. In any case, Hammond is still different from the character of the books, who still seeks to push forward regardless of the fact his animals maul a little girl even before the story begins, and intends to push forward with the park, blaming everyone but himself. In The Lost World as film, he still has good intentions regardless of his methods, given he seeks to protect the dinosaurs while his nephew seeks to exploit them, which the first film already displays the penalties of; people die when around these creatures, and the Hammond of TLW's movie knows that.
For the film as regards to Nedry/Hammond, it all comes down to how you interpreted this line: "if you can find someone else to do all that I did for "what I bid for this job"..." Either Nedry underbid in a desperate attempt to land the gig without knowing the full scope of the work he'd been asked to accomplish, or the contract up for bid was purposefully missing several of the aspects of what needed to be done in order to get people to bid lower and save money. The former is Nedry getting in over his head, the latter is Hammond trying to cut corners, which is within his character even in the movie. Both could also be true, which would explain why they're both quick to blame each other. However, when you put that line together with Nedry's flat bitterness, it suggests Nedry at least confronted Hammond about how much he was being paid for the work expected on more than one occasion. That would suggest the latter, with Hammond hiding behind his morality lessons, and the fact it was a contracted job that Nedry bid on himself for what he's getting paid.
Remember the scene Nedry had with Dodgeson? Where Nedry makes him pay for his food even though Dodgeson didn't order anything? That more than anything suggests that Nedry is a self-centered prick who believes he's far more important than he actually is. It may well be that Hammond was paying Nedry a small fortune but Nedry being the Fat Bastard that he was still felt that it wasn't enough. And given his "financial problems" that are hinted at, he may also be thoroughly reckless with the money he does earn to boot...
Colbert Bump / The Red Stapler: Responsible for amber's popularity in jewelry. Ironic, considering the book has one character express confusion over why Hammond is buying so much amber, since back then it had no cosmetic worth.
The Velociraptors. Before the movies came out, nobody really knew much about Velociraptors or even known they existed. However, after Jurassic Park came along, they have become one of the most well-known and popular dinosaurs around, alongside the T. rex.
Dilophosaurus within the larger Jurassic Park franchise itself. Only a single individual has appeared in any film so far, but you'd be hard-pressed to find ANYTHING else in Jurassic Park that DOESN'T feature them.
Even better. The so-called "safe" high window in the article below is probably no longer safe with the discovery of flight feathers in raptors. While not using them to fly, per se, they are thought to have maybe used them for something called wing-assisted-incline-running like juvenile flighted birds — which means they could possible run straight up sheer walls...
Finding out that Velociraptors were actually rather tiny might have justified the (comically small, nowadays) size of the WD Velociraptor.
Jerkass Woobie: Dennis Nedry. Sure, the guy's a greedy jerk who insults dinosaurs, but considering the financial issues he was facing, as well as Hammond's disregard for them, it's easy to see why he resorted to thievery. Additionally, his death is a bit too gruesome.
Just Here for Godzilla: Let's face it — the dinosaurs are the whole reason why we come to see these movies in the first place.
Narm Charm: The T. rex's little arms come off as funny, but it's still a threatening, carnivorous dinosaur.
Only The Creator Does It Right: The Lost World has a divided fan-base and it was almost entirely different from the plot of the book, while the third movie was an entirely original story with the established characters.
Kelly from The Lost World and, though not as commonly, Tim and Lex from the original also have their share of detractors.
Ian Malcolm can come off as a cross between this and Creator's Pet. His arguments can easily come off as anti-science, anti-intellectual, and at one point outright compares discovery to rape. It certainly furthers Hammond's point that he's more of a "rock star" than a scientist.
Critical Research Failure: The book ends with the island getting fire bombed by the Costa Rican Air force, anybody that actually bothered to read about Costa Rica would know that it doesn't have a Military.
Squick / Nausea Fuel: Arguably the biggest change from the novels to the films, apart from Hammond's character, is the level of gore, which in the books borders on absurd. Those only familiar with Nedry's haha funny death in the film will get a nasty surprise when they reach that point in the novel, and afterward when his corpse is found. Another character, Dr. Wu, is ripped open by a raptor while still alive, feebly trying to fight it.
In the book, Dodgson meets with his unidentified mole, who says he's going to meet Dodgson later in San Jose; later, Hammond picks up Nedry, and only Nedry, in San Jose, thus letting the reader deduce that Nedry will simply return to where he came from. The revelation of Nedry as the mole is nevertheless treated as a shock despite there being no other real suspects.
The first part of the book attempts to keep the reader guessing as to what exactly is causing all these unexplained deaths and injuries in Costa Rica. Because of the movies it amounts to an It Was His Sled moment since we all know it is about genetically cloned dinosaurs, though even the title and the original cover of the book give it away.
Very slight with Grant in the first film. He doesn't get a chance to face down a T. rex with a plastic oar and dart gun or kill several raptors. In the original script, he was supposed to kill the raptors using construction equipment and a T. rex skull.
Muldoon gets a bit of this in first film when he is killed by Chekhov's raptor ambush. His buildup made his even more disappointing.
Broken Aesop: The film removes a lot of the book's setup revealing that the park's staff was already losing control of the dinosaurs, and all Nedry did was accelerate the process. So instead of a lesson on how nature cannot be controlled, you get the impression that everything would have been fine if only Hammond didn't have a traitor in his crew.
The dinosaurs are still breeding, the storm is implied to be causing major difficulties, the animals don't want to be fed, and there's numerous safety hazards (like the fact the cars don't automatically lock). Arguably, the movie manages an Adaptation Distillation of the point Doctor Malcolm is making that you can't control a complex system absolutely.
Do Not Do This Cool Thing: The film doesn't seem to be clear about whether bringing back dinosaurs is a good thing or not. It wants us to think it's a bad idea, but then goes out of its way to present the result as awe-inspiring.
First Installment Wins: For the three films you'd be hard pressed to find anyone who considers the two sequels to be better (or even on par) with the first one.
Narm Charm: "They're moving in herds. They do move in herds."
Narm: When Hammond is talking to Grant in the telephone and suddenly hears the gunshots of Grant's weapon as he tries to keep the raptors away, he yells out loud Alan's surname. However, the way Richard Attenborough delivers it sounds more like he's yelling "cunt" or "clowns". Listen to it here.
Nightmare Fuel: The roars of the T. rex; the screeching of the raptors with children on the menu was downright scary.
Special Effect Failure: There are many spectacular and highly convincing visual effects in this movie. Ray Arnold's severed arm is not one of them.
Neither is the Digital Head Swap for Lex during the climactic air vent chase; it was done out of necessity after the stunt double had accidentally looked up during the shot.
During Nedry's conversation with the man at the docks, you can see a playback progress bar scrolling underneath the computer feed, making it quite blatant they're using a video file for the scene.
Tear Jerker: Hammond is a pretty tragic character when you think about it. He's worked for years to realize his dream, and it looked as if it had finally come true... but instead, he had his dream crumble around him and result in the horrible deaths of quite a few people, and was forced to abandon it. His reaction to hearing a Brachiosaurus call one last time before leaving the island is especially wrenching. His dream gets a bit of a Bittersweet Ending in The Lost World, however: While he wasn't able to build a park and share his dream with the world, and even more people die on Site B, at least his dinosaurs are allowed to thrive there.
Visual Effects of Awesome: This movie is the milestone that popularized CGI in the nineties. The special effects team actually had to invent entirely new technology to get the job done. Made more awesome because the effects have held up better than most of Jurassic Park's 1990s CGI-riddled contemporaries, and even some films now.
And even with all the new CGI, it might surprise that many of the dinos were still shot with traditional animation techniques, such as animatronics, puppets, and even stop-motion animation (such as the shot of the T. rex pushing the car. Both were miniature models).
The 3D re-release looks better than several modern 3D movies.
Alan and Ellie struggle to keep a raptor from forcing open the door to the control room. A shotgun is nearby, but just out of reach and neither wants to risk going for it, so the life-and-death struggle ensues. Makes sense, all things considered...except for the fact that Tim and Lex are also in the room. At least Lex has the excuse of working to reactivate computer systems. Why Alan and Ellie don't think to ask Tim to hand them the shotgun, or why Tim doesn't think to do so himself instead of thumping of Lex's chair and telling her to hurry up, is a mystery.
When the T. rex has burst through the fence, Lex grabs a large flashlight, turns it on, and uses it to try and see what's going on, thus inadvertently attracting the T. rex to their jeep. And then doesn't turn it off, even when her brother is screaming for her to do so. She just warbles on about how 'sorry' she is.
And the PG-13 rating hardly stopped kids from seeing the first movie, as it was marketed to children through toys and other merchandise despite being fairly violent and scary. That the movie was responsible for trouncing the animated film Once Upon a Forest in the box office is particularly telling, given that there was no competition from Disney that summer (save for Touchstone's The Nightmare Before Christmas.)
Trespasser. Even if it is responsible for innovations that are still felt in games today (truthfully, it was probably too innovative for the time it came out), it's still one of the most Obvious Betas in video gaming history.
Jurassic Park Interactive on the 3DO, a title which has no clear idea of what it wants to be, as well as not using the JP license for anything worthwhile.
Telltale Games's episodic Jurassic Park The Game received mixed reviews, both praising and criticizing the attempt to take inspiration from Heavy Rain. Favorable reviews praised the atmosphere and the respect for the franchise's spirit, while negative reviews criticized the graphics and (some of them) the gameplay as more akin to a FMV game, lacking the amount of player agency of previous Telltale games or the games by David Cage.
Awesome Music: The first game has some pretty good tracks that fit well with the action on screen.
Big Lipped Alligator Moment: The arcade game consists of half an hour of dino shooting action. At six minutes in you must shoot a Mamenchisaurus's butt to help it poop. No, really.
Fridge Horror: So you rescue the baby T. rex, mend its leg, then return it to the wild, but a few minutes later you kill both of its parents...