Season 3, Episode 21. Jess looks at a copy of "Naked Lunch" at Small World Books.

Season 1, Episode 16. Lorelai mentions having read every Nancy Drew while questioning Rory about her break-up with Dean.

 Season 1, Episode 11. Rory reads this in the cafeteria. Max recites a line from poem 258 “There’s a certain slant of light“.

Season 3, Episode 13. Lorelai reads this when she waits in the hospital for Sherry's baby to arrive. 

Season 3, Episode 17.  Lorelai gives Dickens a nod when she compares Rory's pro/con list to Nicholas Nickleby."
Season 6, Episode 4. Jackson mentions sitting through hours of hell whilst watching Sookie’s cousin’s production of Nicholas Nickleby.  

Season 1, Episode 8.  Dean gives a Jane Austen book back to Rory and he seems to have liked it.
Season 3, Episode 4.  Rory reads Northanger Abbey in the gazebo during her "perfect Stars Hollow day."