The title is an explanation of the "Nag Hammadi" reference that nobody gets.
Lorelai compares Jess to Rocky. In 2006, Milo Ventimiglia, who plays Jess, played the part of Rocky's son Rocky Jr. in Rocky Balboa (2006).
The Nag Hammadi library (also known as the Gnostic Gospels) is a collection of early Christian and Gnostic texts discovered near the Upper Egyptian town of Nag Hammadi in 1945.
Jill Brennan (Carrie) previously appeared in the pilot episode as a different character called Mrs. Traister