The Movie: Jurassic Park's main attractions are the brachiosaur, the dilophosaur, the Triceratops, the T-Rex, and the velociraptors. They are all very scaly.
Real life: Brachiosaurus and Dilophosaurus both roamed the Jurassic (though at very different times), but the big guns like T-Rex, Triceratops, and the Velociraptor were all beasts of the late Cretaceous, so the Park might be better named after that period.
Also, since the movie came out in 1993, it has been confirmed that Dr. Grant's theory about dinosaurs evolving into birds is true. Indeed, had the movie's scaly characters been cloned in real life, they would have been feathered. Raptors definitely sported feathers, and there's good evidence T-Rex did as well. Turns out Dr. Grant was right when he said "you'll never look at birds the same way"! So the next time you see a pigeon picking at bread crumbs or a robin rooting around for worms, remember: you are looking at a dinosaur!