When Rory is telling her family about not getting the job at the New York Times, Emily says that "if your name isn't Keller or Sulzberger you may as well not even apply." The Huntzberger family is modeled after the Sulzbergers.
The lullaby playing when Lane puts the twins to bed is "Boys Don't Cry" by The Cure.
During karaoke night, when Kirk is singing, one of the signs behind him says "Buzu Barns". Buzu was in the Zydeco band who auditioned for Lorelai and Luke's wedding in season six.
Lorelei jokes with Luke about his boat trip with April and tells him to stop at a place in Southern Maine called "Barnacle Billy's". Barnacle Billy's is indeed a great place to stop for lobster and a view and it is in Perkin's Cove (Ogunquit), ME. Also, Sally Struther's (Babette) often appears at the Ogunquit Playhouse, just down the road from Barnacle Billy's.
This is the first time we see Steve and Kwan, Lane and Zach's baby twins.