SGI was well-known to the film industry, because their IRIX systems were basically the sine qua non of graphics workstations and powerhouses. SGI invested heavily in the graphical capabilities, including 3D rendering, and therefore when the industry graduated from Amigas with the "Video Toaster" they slid into SGI systems quite nicely.
So it stood to reason that a couple of them would show up in an actual film. How plausible it was to have SGI systems on-site at a Jurassic Park type lab? I don't know, but seems reasonable, if they were also crunching DNA numbers.