One Ref in this episode appears to be one to Medieval Times... there's lots of Theme Parks of Other Eras, but Medieval Times seems to be the king of the anachronism, with historical gaffs that seem to span at least 1000 years (Druids and "serving wenches"... Druids were long, long before medieval age, and the term "wench" didn't appear until long after)
Cowboys on hoverbikes hunting buffalo... Einstein disco dancing with Hamurabi(sp?)... all in all, past-o-rama was quite funny, imho.