In the midway preshow video, as Krusty looks for a family to be the first to go on his new ride, a bald man with glasses, Miss Albright (the Sunday school teacher), and the Flanders family all disappear and then reappear in-between shots. Also the metal gate the Simpsons stand behind turns into a velvet rope.
When the Simpson family are sitting in their living room, the floor, walls, and ceiling fly out into space. Off the the very right of the screen, a pink wall can be seen floating away. It then completely vanishes in mid air. (It is best visible if you're sitting on the right top level of the theater.)