Several monsters were inspired by some cheap plastic toys from Japan (and tell me the Hook Horror doesn't bear a striking resemblance to Gigan, I dare you). You can encounter creatures from every real world myth and legend, from Leprechauns to Kobolds, to Rakshasa. The game has airships, space ships (magical or technological, Clarke's Third Law notwithstanding), and in the Planeswalker's Guide of 2e, there was a Wizard Kit for a guy who floats around on a balloon! Planescape has people communicating in Victorian gutterspeak, and you can even play a clockwork Rogue Modron, a part-fiend, part-celestial, or part-genie!