CHRISTOPHER: How many references? …
LORELAI: Twelve, including a few bars of “I’ll Go Home with Bonnie Jean”.
One of the songs from Brigadoon. The song is sung by Brigadoon villager Charlie Dalrymple, who marries fellow villager Jean McLaren in a traditional Highland celebration. The connection with weddings is presumably what puts it in Lorelai’s mind.
The Annotated Gilmore Girls 