There's not a soul out there who doesn't recognize this logo. There's also probably not a soul out there who doesn't know that Jurassic Park is chock-full of dinosaurs, destruction and Jeff Goldblum. But there are a few things about this movie that most people don't know.
Spielberg offered the role of Alan Grant to Harrison Ford, but Ford turned it down. Between Indy and Star Wars, Ford had a lot going on and didn't regret his decision. Among other roles up for grabs were Christina Ricci as Lex and Sean Connery as John Hammond.
The T.rex rig was transported to the Warner Bros. studio skinless so a team could test the hydraulics on the robot. Once the hydraulics were all good to go, the skin was then glued onto the rig. But to get to the middle of the giant robot to finish the project, one worker had to crawl inside. "If the power was shut off for some reason," said the crew member, "the head would move from its powered-up position to its powered-down position ”” and all of the hydraulic cylinders and sheets of metal inside would move. So, as I was crawling inside this thing, I said to the guy on the controls: `Don't shut it down, and make sure nobody trips on this cord. I'm going to be inside, and if this thing moves, with all those hydraulics inside, I'm dead.'" Luckily, he made it out alive.
See that pile of what is supposedly dung? That's not actually dung. Surprising, right? It was composed of mud, clay, honey and papayas so flies would be attracted to it and make it look more realistic.
At the end of the movie, the Jeep's logo is covered in mud. The mud just so happens to spell out "UR ASS PARK" which is actually not a coincidence but a slight-handed joke from the set decorators about how people are lucky to get their behinds out of the park in one single piece.
The roar of the T.rex was composed using various different animals including elephants, tigers, alligators, dogs and penguins. Because everyone knows how vicious penguins are. The animatronic T.rex was also reported to randomly turn on and malfunction when it had been raining, basically scaring the living daylights out of the crew.