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
Marge: Oh look. A welcome mat that tells you your weight. (Homer steps on it)
Welcome Mat: Your weight is..... (Breaking) warranty voided.
(After Homer opens a shipping crate)
Grampa: Moe?! You shipped yourself here?
Moe: No, it's how you fly coach on Delta now.
Irish Policeman #1: So, it's a smoke-easy you're running then?
Homer: Uh-oh! (tries to flee with Grampa)
Irish Policeman #2: Toots! It's escaping you're thinking of then?
Homer: I can't tell if those are questions or statements!
Irish Policeman #1: So, it's our syntax you're criticizin' then?
Blackboard Joke: Four leaf clovers are not mutant freaks.
Couch Gag: Each family member is walked into the room on a leash like a dog in a show. Bart is declared the winner and Homer attacks him.
Billboard Gag: Pay For Septuplets, Get Octuplets Free! (with Dr. Riviera pictured holding a set of babies hanging upside down in each hand)
This episode was broadcast in the UK and Ireland on St. Patrick's Day (17th March) before it is was transmitted in the US for the first time in the show's history.
A scene outside Blarney Castle, which houses the famous Blarney Stone, shows a family taking a picture of a small pile of rocks called Blarney Rubble, a mock name of The Flintstones character Barney Rubble.
Glen Hansard and Marketa Irglova guest star and appear as their characters from the 2006 film Once. Hansard also sings the song "Falling Slowly" from the film.
While the Simpsons drive through Dunkilderry several American businesses are parodied with an Irish name. Victoria's Secret is Colleen's Secret, Saks Fifth Avenue is Mac's Fifth Avenue, Hard Rock Cafe is Sham Rock Cafe, Hewlett Packard is Hewlett Fitzpackard, Microsoft is Mick-rosoft, Cisco Systems is Cisc O'Systems, Bed Bath & Beyond is Bog Bath & Beyond, and Taco Bell is Taco Belfast.
Krapp's Last Tape
Tom O'Flanagan describes himself as an "old man yelling at his tapes." This is a reference to the modern Irish play, Krapp's Last Tape.
Bart, Lisa, and Marge jump along The Giant's Causeway, a rock formation, in the style of the classic 1980's video game Q*bert.
In the Name of the Father
The title of this episode is a play on the title of the 1993 film In the Name of the Father.