Bart has copy of Herge's "Crab with the Golden Claws"
A rock formation labeled "Blarney Rubble" is found next to the Blarney Stone.
A man on the street tells Homer that he is in AA. Homer replies, "Who are you, stuttering Fonzie?!"
Homer mentions it in court.
When Marge, Lisa and Bart meet the street musician, the viewer sees the characters from an Irish movie titled "Once"
Tom O'Flanagan and O'Flanagan's Pub are from this episode.
Marge, Bart, and Lisa play a game of "Q-Bert" on the Giant's Causeway.