The trick a lot of the time with the original Jurassic Park was to hide the special effects under cover of darkness. The first big, showy action scene in the film takes place at night, in the rain, so as to conceal any drawbacks of the miniature and animatronic T-Rex as it trashes the Jeeps and eats that lawyer who's on the toilet. But then, some of its most subtly brilliant bits of SFX occur in broad daylight like the birthing of the raptors from their eggs in the InGen labs, which happen under harsh fluorescent light and look about how you'd imagine tiny dinosaurs cracking open a shell and squealing would look and that's all done with animatronics. Jurassic World apes that iconic scene in its opening shot, except it does it with CGI. Which not only looks crappy in comparison to the Jurassic Park scene, but also because using an animatronic means the movement of the creature cracking its egg are somewhat natural. How exactly is the baby raptor smashing things open with its claws only?
Tom Baker is the Comics Editor at WhatCulture! He's heard all the Doctor Who jokes, but not many about Randall and Hopkirk. He also blogs at http://communibearsilostate.wordpress.com/