The graphics (and sound!) remind me of the 1981 BBC Hitchhiker's Guide to the Galaxy TV series. The DVD release of the original BBS television series had a "making of" about the graphics, which were done using stop-motion photography of hand-made transparencies. I suspect these graphics were done the same way.

(If I could find that video online I'd link to it. I'm having no luck and I can't be bothered to go digging for the DVD...)