Accidental Innuendo: Sarah Rawlins gets rather horrifically mauled by a raptor in the second film. If you're watching, it's extremely gory and grotesque. If you just listen to the audio however, viewers report it sounds like it's... doing something else to her.
Complete Monster: Dr. Jane Tiptree from the original is an amoral geneticist seeking to eradicate humanity to return Earth to a series of artificially-engineered dinosaurs. Tiptree, believing humanity to be a "disaster", creates a virus to forcibly impregnate human females with raptors, causing them to give birth to the specimens in a painful and eventually fatal manner. This virus is unleashed on her own subordinates, the surrounding countryside, and eventually herself, with the ultimate goal of this to kill off every human female and starve out the rest of the male population. Tiptree's experiments in breeding raptors lead to one of her specimens prematurely breaking loose and going on a rampage in which dozens are killed, while Tiptree coldly has the father of someone whose daughter was killed by her creations killed off by a tyrannosaur. Though Tiptree is soft-spoken and amicable, ultimately she's little more than an omnicidal misanthrope who seeks to wipe out mankind based on her own delusions.
In the the first film and novel a Deinonychus gets into and kills two teenagers in a van. Unlike in the novel however, where the creature is fully grown, the animal in the film starts as a baby and grows up throughout it. The attack occurs when it is still a juvenile, so the resulting scene is a critter the size of a schnauzer killing two people.
Aside from the bad special effects in general, a character in Carnosaur 2 attempts to box with a velociraptor. Really.
The rather obvious Product Placement for Coca-Cola in the first movie's boardroom scenes.
Sarah Rawlins' death in the second film is extremely graphic visually. But turn the video off and just listen to the audio it... sounds like the Raptor is doing something else R rated to her.
So Bad, It's Good: While not even fans disagree they are definitely B movies, many will consider at least the first two films pretty firmly this.
In the raptors' case, you can immediately tell they are "men-in-rubber-suits". In the T-rex's case, it often appears to be stop-motion animation of someone playing with a T-rex toy. Even though it isn'tnote it's actually two animatronic models with slightly different scale patterns.
The Deinonychus effects in the first film were done with a mix of antimatronics and a hand puppet of all things. It looks less like a dinosaur attacking people and more like Kermit the Frog going on a homicidal rampage.
The T. rex in the Eden Formula, when it's not stock footage from Carnosaur 1 and 2, is rendered in CGI so terrible it makes the original Carnosaur look like Jurassic Park by comparison. There is what appears to be at times an animatronic head and what appears to be a hand puppet, but the CG dinosaur, the handful of new practical effects and the stock footage from previous films is so badly put together that the T-Rex looks vastly different in between shots.
Also from The Eden Formula, one scene has a villain hotwire a car and drive off with it. The scene of him driving is stock footage and the car in question suddenly has two passengers!
Spiritual Adaptation: Carnosaur 2 ripping off Aliens also results in an unintentional Dino Crisis adaptation, basically having similar plots: a crew of combat specialists infiltrating a high tech facility crawling with velociraptors and a T. rex.
The novel discusses atavistic fear a few times. The conceit being that because primitive mammals learned to stay away from giant reptiles, the smells and sounds they make reawaken survival instincts in humans. Similar theories are put forth in Real Life about why nails on a chalk board or sirens causes unease (i.e. that they sound like the calls of predators that hunted our ancestors while they were still small.)
One subtle way the Deinonychus demonstrates its bird-like qualities is when it spots someone through a glass display case, and it crashes straight through it rather than walk around. Like modern birds that fly into windows, it failed to recognize the glass was there.
Hilarious in Hindsight: In the book, the characters outside of Penward routinely mistake the Tarbosaurus for a Tyrannosaurus rex. When Tarbosaurus bataar was originally discovered, it was actually considered a second species of the Tyrannosaurus genus and there still are researchers like Dr. Gregory Paul and Dr. Thomas Carr who lump it and Tyrannosaurus rex into the same genus as Tyrannosaurus bataar. If it turns out they're right, the characters in the book were right after all.
Jerkass Woobie: You eventually get to feeling sorry for Jane Penward, despite her many character flaws.
Older Than They Think: This book had some key elements that Jurassic Park would later bring to the public conciousness several years before it came out. Namely, dinosaurs are portrayed as bird-like, quick, and intelligent instead of lumbering cold blooded brutes.