Historically, Sherri and Terri seem to have a problem of being separated from each other. However, in "Bye Bye Nerdy" one of the twins are seen by herself in swim class with Lisa.
Pulling the fire alarm would not activate the building's sprinkler system. Instead, it would be the other way around (the sprinkler activating the fire alarm system when set off.)
Show Title: Radioactive Man flying in the sky carrying his bride, with a "Just Married" banner and cans attached to his boots.
Billboard Gag: Krusty: Live from Rehab 8PM. (with a saddened Krusty pictured with his hair flopped down)
Chalkboard Gag: I will obey Oscar campaign rules from now on.
Couch Gag: This extended sequence parodies a movie trailer (including a narrating voiceover and approval tag) in which the family is performing various action stunts as seen in various films before reaching the couch. After they're seated, a comet strikes the house, blowing it to kingdom come. The title of the movie is The Couch: Don't Get Comfortable.