 Two scenes from the book were excised , with Spielberg removing the opening sequence with <unk> attacking a young child as he found it too horrific , and Koepp cutting for budgetary reasons the T. rex chasing Grant and the children down a river before being tranquilized by Muldoon . Both parts eventually saw inclusion in the film sequels . Spielberg suggested the addition of the scene where the T. rex pursues a jeep , which at first would only have the characters driving away after listening to the dinosaur 's footsteps . 
