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The music playing during Maggie's story is the Second Movement of Beethovan's 9th Symphony.
The picture that Maggie draws on the wall in the final scene is Vincent van Gogh's "Starry Night".
In the Macbeth parody, no one seems to care that Marge says "Macbeth" in the theater, despite the fact that doing so is taboo.
When the inspector opens the book "Go Dog Go," the front cover is on the back.
This episode marks the first usage of the grounding, since Fraudcast News in Season 15. It would also be the first of four references towards being grounded over the course of Seasons 20 and 21. The other episodes include Waverly Hills 9021-Doh, The Devil wore Nada, and Postcards from the Wedge. The latter episode would ultimately feature the series' first ever true grounding, and the first to stand for the rest of the episode.
Goof: At the beginning of the episode the letters fall off the school that say "Springfield Elementary School". Three "n's" hit Willie in the head and land on the ground sideways representing "z's" when they knock him out. But there aren't enough "n's" in the school title to accomplish this.
According to Comic Book Guy's receipt, Springfield's sales tax is 8.25%.
According to this episode Reverend Lovejoy went to Texas Christian University.
Music from this episode
The violinist in Homer and Marge's basement is playing the opening theme from Tchaikovsky's "Piano Concerto #1".
Homer and Marge's divorce and remarriage, mentioned in this episode, occurred in episode 159, "A Milhouse Divided."
Krusty: Heil, heil.
Mel: Ach du lieber. Krusty spritzen the Gaswasser.
Krusty: Ja, ja. Krusty spritzen the Gaswasser.
While the meaning is easy to understand the lines are not really German. Starting with the greeting 'Heil' which was used while the Nazis where at power. Its usage is probably intended though.
The line "Krusty spritzen the Gaswasser" translates to "Krusty is spraying gas water" while containing several mistakes. Spritzen is the basic form like spray, should be spritzt. In Germany the term 'Gaswasser' is not used, at least not in this content. Usually its Sprudelwasser. The English 'the' is probably just left to mock on the complicated German usage of der/die/das.
While in Ireland Marge and the kids visit the Giant's Causeway. This geological formation is actually located in Northern Ireland, which is part of the United Kingdom and therefore a different country. The Giant's Causeway is about four hours drive from Dublin.
During the scene where Bart watches German Krusty, in the background of the pub is what looks like a portrait of former Simpsons writer Conan O'Brien.
Music from this episode
"When Irish Eyes Are Smiling" by Ernest Ball, Chauncey Olcott and George Graff Jr. (During the opening credits Lisa plays this on her saxophone.)
The name of the airline the Simpsons fly on is Derry Air.
The look of Blarney Castle is very accurately represented from both the outside and inside (It's basically just a shell), however, one important detail is wrong: Tourists are lowered on their backs to kiss the Blarney Stone with their heads hanging upside down.
Items on Grampa's "Things I Want to Do Before I Die" list:
Pitch in the Negro Leagues
See the Chrysler Building
Have one more beer at O'Flanagan's Pub
Get cheated by an Irishman
Aggravate my son
See NBC go under
Find my keys
During the couch gag, Sideshow Bob enters the Cheers pub. This is a nod to Kelsey Grammer who voices him, as Kelsey began playing "Frasier" in the Cheers which led to the spin-off.
The address on the Blue Umbrella Insurance letter at the beginning of the episode is "100 Balloon Payment Blvd."
People spotted on the "Springfield Wall of Fame" are: Diamond Joe Quimby, Rainier Wolfcastle, C.M. Burns, The Springfield Strangler, Duffman, Krusty, Hank Scorpio, Troy McClure, Bumblebee Man, Bill and Marty, Artie Ziff, Sideshow Bob, Poochie, Mr. Teeny, Itchy and Scratchy, Drederick Tatum, Bleeding Gums Murphy, Paul Yield, Chazz Busby, Gabbo, Lurleen Lumpkin, Principal Skinner, El Barto, Homer Simpson, Butthead, Fat Tony, Harry Plopper and Vance Conner.
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Classics, Sitcoms, quotable, dysfuntional families, lazy father figure