Artimus makes a theory about the abandoned toliet as "some kind of majestic throne." The words "majestic throne" refers to that movie's setting of Royal Rookery Rock.
The Penguin(s) gets chased by a Polar Bear. In "Bluetoes", Lonesome gets chased by Whitey. In "ISoS", Princesses Lucinda & Crystal gets chased by "the bear in the furry suit".