In the book John Hammond has no idea how computer work and hires Dennis to do the programming for the entire park and every system in it and then constantly rages at him for not programming everything fast enough. You feel for Dennis alot more in the book. Also in the book John Hammond saying "spared no expense" is seen as a joke cause he is constantly cutting corners and cheaping out to get the park open so Ingen stops hemorrhaging money and to appease the share holders

The first Jurassic World makes it look like the idea did work for a while…