well, if you want to get pedantic, the image referenced by the html in the background window is a png file--png's I belive came out in the late 90's. And the image name clearly references "weyland" the linux windowing system that came out way later than that.

I also remember the dicsussion in the movie at the time going on about georeferencing. Not saying that concept wasn't out there at the time, but it would have been miles from a 15 year old's fingertips.