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..
Contemplate Our Navels: A reporter repeatedly gives speeches of this nature during the film's climax, much to Mike and the Bots' annoyance.
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. But happily, Shout Factory has finally obtained the rights and it's been announced for the upcoming volume 28 box set!