The real Dilophosaurus had no neck frills, was a monster at a length of 20 ft, and did not spit venom. When Jurassic Park was shot, Dilophosaurus was already known to be a large dinosaur, while the frills and the venom were fictionalised embellishments.

What dinosaur has a frill?

ceratopsian, also called ceratopian, any of a group of plant-eating dinosaurs from the Cretaceous Period (146 million to 66 million years ago) characterized by a bony frill on the back of the skull and a unique upper beak bone, called a rostral.

Did the Dilophosaurus have frills?

Many people are at least vaguely familiar with Dilophosaurus thanks to its bit-part in the first Jurassic Park movie. It was that small-ish, cooing theropod with a pair of crests on its blunt head and that turned out to have a shocking extendible neck-frill and the ability to spit venom like a cobra.