Michael Crichton’s original novel features a scene where a T-Rex dives into a river while chasing after the raft carrying Dr. Grant, Lex, and Tim. David Koepp, co-writer of “Jurassic Park,” recalled a moment from reviewing the film’s storyboard, “[Spielberg] like thumbed past [the river] and went, ‘Nah,’ we’re not gonna do this one.’ So it was cut very early on.”