The single biggest twist in Jurassic Park - aside from Raptors being open to open doors - comes when palaeontologist Dr Alan Grant realises that the dinosaurs are breeding despite the fact that they were genetically engineered not to do so. In the words of Jeff Goldblum's Ian Malcolm, life has... ah... found a way. There's a wonderful easter egg earlier on in the film that foreshadows this realisation: when attempting to buckle his seatbelt on the helicopter ride to the island, Dr Grant fails to pair the "clasp" (known as the female end of the belt) to its port as the chopper takes off. Instead of looking for the right solution, he simply gives up and ties the two ends together - effectively coming to the same solution a different way. That of course rather crudely offers the answer to how the dinosaurs on the island procreate when faced with the same clash of parts.
