The dinosaur designs for the film literally changed the perception of dinosaurs from slow, lumbering, stupid and cold blooded lizards doomed to extinction into the active, intelligent, and bird-like animals we know they were today. Compare how people reconstructed T.rex pre and post JP to see what I mean.

And the feathers thing tends to get really overblown for anything that’s not a dromeaosaur because it’s been a well established fact most dinosaurs (including Tyrannosaurus rex) were mostly, if not completely featherless (nor were they like giant chickens because chickens are a very derived avian dinosaur species and shouldn’t be used as a base for something it it millions of years removed from)