I've yet to find any true Easter Eggs in the game, but slightly neat was attacking the genie, and using the evil element that she gives you on the Vampiress in the castle. There's also a few hidden areas with paltry chests, but that's all I've found. You would think that over the course of four years development they would add something special in the game, though....
- John
http://www.tk421.net/wizardry/