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.
Contested Sequel: This film probably has as many people who like it as people who dislike it.
Ending Fatigue: Once the main cast gets rescued off the island, we see that InGen has successfully bagged a T. rex which makes the heroes feel they have ultimately lost. This seems like a decent drop-off point and sequel hook, but the film continues for another thirty minutes so the T. rex can terrorize San Diego for a second climax.
Hilarious in Hindsight: The velociraptors ambushing and killing the unsuspecting hunters wandering in the long grass brings in mind of Pokémon to modern audiences, especially with the line "Don't go into the long grass!"
Any scene between Nick and Sarah, given their roles in Gus Van Sant's Psycho remake the following year.
Memetic Mutation: Professor Oak warned you about the long grass!note It's a common joke to combine Pokemon with the Velociraptor scene.
Moral Event Horizon: In one of the rare variants where a good guy crosses this, unintentionally from the writers. Nick Van Owen, to some of the fans, crosses this by unloading the bullets from Roland's gun. This guy just doomed many people, who helped him out, by the way, to die simply because of his displeasure with hunting. The worst part is that since he's a good guy, not only that but the T. Rex in question goes on another rampage later on, in the highly populated San Diego. This isn't viewed as such in the movie, furthering the Designated Hero aspect.
The Lost World falls headfirst into this. The antagonists are supposed to be evil because they claim the dinosaurs are property of the local Mega Corp., when that's exactly what they are: they wouldn't even exist if they hadn't been deliberately created, which also nicely shatters the protagonists' argument that they should be left alone to live naturally, nature having nothing to do with it.
This is one of those cases where what's right legally may or may not be what's right morally, but it's certainly not as cut-and-dried as Malcolm's party (or his detractors) likes to present it.
Tear Jerker: Poor Eddie, who's the only one sane enough not to be in the trailer when it goes over the cliff, saves everyone's lives by putting the line around the tree, and puts up with them teasingly ordering fried food when he asks if they need anything else... and is rewarded by getting ripped apart by two Tyrannosaurus while the others can do nothing to help. What bites harder is that his poison dart gun got stuck at the wrong moment, meaning his death could have been (narrowly) averted were it not for sheer bad luck.
Then Roland demeans him for no reason other than he can, at least Ian stuck up for him.
Roland's reaction after discovering what happened to Ajay, and his departure shortly afterwards.
Tough Act to Follow: Keep in mind this was Spielberg's first film following Schindlers List, the film widely considered his Magnum Opus, to say it's an underwhelming follow-up is very true. Not to mention following up the first Jurassic Park movie, which revolutionized dinosaurs and CGI in film forever.
What an Idiot: Sarah Harding. Despite allegedly being an expert at working with animals, the first time we see her she makes possibly the worst mistake imaginable (and one even the general public knows to avoid). She deliberately walks up to a young Stegosaurus and touches it. Several moments later its parents nearly kill her. Further highlights of her "expertise" include helping let the dinosaurs out of their cages, after which they promptly go on a rampage; taking a Tyrannosaurus child back to her trailer (showing she learned nothing from the Stegosaurus incident) and keeping the shirt which is soaked with the blood of the T. Rex baby. Just from her insane actions alone she nearly dies four times, and gets a lot of other people killed because of her idiocy. She also ignores her vastly imperfect but knowledgeable boyfriend, eyewitness to the last nightmare.
She may just be following in her father's footsteps—in the book it's revealed she's the daughter of Dr. Harding, the original park's vet...who in the movie not only couldn't figure out why the Triceratops was sick but had to have Ellie, the paleobotanist, tell him the Trike had dilated pupils. Perhaps this is another example of Hammond cutting corners by hiring an incompetently trained vet?
You Keep Using That Word: The protagonists constantly claim that the villains are interfering with the dinosaurs' natural habitat. Because artificially created dinosaurs, 65 million years out of time, living on an island created specifically for them, is precisely the definition of natural.