Rory finds out that Gran met Kennedy, Johnson, and Nixon. These are the same presidents that Forrest Gump met.
The scene where Lorelai is on the phone to Emily and finds out that Gran passed away, Michel is in the background playing with the TV and mentions Charlie's Angels: Full Throttle (2003). Melissa McCarthy, who plays Sookie, had a bit part in the first Charlie's Angles movie and in a deleted scene for the second movie.
Glenn says "Welcome to the Dollhouse", this is the name of the Season 5 finale of Pretty Little Liars. Both Pretty Little Liars and Gilmore Girls use the same set for their towns.