Jason tells Richard one of the reasons he doesn't want to work with his father anymore is that he wants to go one day without being called Digger. Richard and Emily also consistently call him Digger throughout the episode. However when Lorelai calls him Digger, Richard chides her and says he hasn't been called that in years.
When Sookie and Lorelai are arguing about the children's food at the birthday party and they make their way to the kitchen, the Lord of the Rings movie sounds repeat twice.
In the Open-DOE policy scene, when Paris and Rory are talking and Rory is on the couch, she puts a sheet down to sit on. The sheet is up on the back of the couch, and then not, and then up again.