Zach tells Luke that it's obvious Luke used to play ball. Scott Patterson, the actor who plays Luke, actually did play minor league baseball for eight years before pursuing an acting career.
The actress who plays Mia in this episode is a different actress than the one who plays Mia in Season 2.
When Rory goes outside to talk to Logan carrying a plate with a piece of cake, he says "you didn't have to bring me cake" and she responds: "I didn't". This is similar to the dialog they had in season 5, episode 7 "You Jump, I Jump, Jack" at the life and death brigade event, when Logan came to sit with Rory carrying a plate with food, and she said "Thanks, I've eaten" to which he responds "Good, this is for me".
Lorelai teases Emily that she has a "thing" for Will Smith. Kelly Bishop was in "Six Degrees of Separation" (1993) with Will Smith.