Generally full marks on realism, but I have to ask: Is a combination of SGI and old school macs a sensible platform for running a park? I guess if the macs can get on an appropriate network then they could at least send control commands, but they feel like an odd fit compared to the UNIX™ boxes.
Movie-Nedry struck me as a certain kind of hacker trope (but whom I've also met in real life!) where part of their "compensation" is access to unusual and high end computer hardware. It's irrelevant whether it's the best tool for the job (and as the page notes, Nedry seems to use his fancy SGI system mostly to render 3D chess). But, at least in principle, it's relatively cheap payment to keep your programmers happy (…
I don't think that it makes much economic sense. That hardware was extremely expensive at the time, developer salaries weren't as high, and hardware progress was extremely fast, so the computers had to be replaced every two or three years to remain practical, not just cool.