The Cameo: Leonard Maltin appears to advise Pearl on what bad movies to show Mike and the bots. He recommends this, though he confesses to liking it himself (having given it an above-average rating in his movie guide), although it supposedly put some of his assistants into intensive care..
Keep Circulating the Tapes: A particularly infamous example. The episode aired only twice (on the same day) before MGM filed a copyright claim and it never aired again. Because of this, it's very unlikely it will get a DVD release. However, this may change in light of MGM's recent bankruptcy.