Alright, so I just finished a re-read of 'Jurassic Park', and this is one of my favorite things to geek out about. Crichton's accuracy is a fascinating mess. He leans on the late 80s/early 90s science, which was honestly in a state of flux, and he clearly prioritizes storytelling. For instance, the book explicitly mentions that the dinosaurs aren't 'real' dinosaurs; they're engineered creatures with frog DNA, which is his built-in excuse for any inaccuracy.
But let's talk specifics. The velociraptors are hilariously oversized—more like a Utahraptor, which hadn't been discovered/announced when the book was written. The dilophosaurus with its frill and venom? Pure fiction, a great horror creation but not based on any fossil evidence. The tyrannosaurus rex's vision being based on movement is also a debated idea that's largely been discarded. So, by modern paleontological standards, not very accurate at all.
The charm is how he weaves the science that was known into the narrative. The discussions about chaos theory and the problems of cloning feel grounded, even if the dinosaurs themselves are movie monsters. In that sense, it's accurate to the spirit of scientific overreach, just not to the creatures themselves.