As an IT nerd I loved how they made the door out of rack slides. Probably the easiest and cheapest way to make something that seems futuristic, but if you work with servers you see them every day.
The opening scene is also epic, still legendary to this day. I rented the movie on VHS back in the day, looked promising, but I wasn’t that interested to be fair. Then the opening scene happened and I was glued to the screen.