The scenes in which Lorelai and Christopher are at Yale were actually filmed at the University of Southern California. The "Welcome to Yale Parents' Weekend" sign covers the sign for Bovard Auditorium on the USC university campus.
The room in which Christopher and Lorelai listen to the lecture on astrophysics is the same room where Logan, Colin and Finn played a joke on Rory in But Not as Cute as Pushkin (2004).
Kirk, Sean Gunn, saying 0700 hours tonight instead of 1900 hours, may be intentional, as Kirk often "mispeaks" or does things in his own way.
The song the a capella group is singing when Christopher and Lorelai walk by is Bon Jovi's "Living on a Prayer".
Devon Michael, who plays Bill in this episode, graduated from Yale. Lorelei, Christopher, and Rory tease about the amount of a capella groups at Yale. Devon was a member of Duke's Men of Yale a capella signing group.