In the scene where Lisa is chasing the dinosaur, she runs past a room with three dinosaurs lighting up cigarettes and smoking. This is a direct tribute to Gary Larson's comic where he suggests the "real" demise of the dinosaurs.
During the first scene in the coffee shop/bookstore, the camera zooms in on the book writing team past two sets of bookshelves, too quickly to read the titles on the books. If you pause the show to look at the books, you can see that one of the titles is "Death to Freezeframers".
One of the books featured at the Springfield Book Fair is Steve Hely's "How I Became A Famous Novelist," which also revolves around the deliberate creation of a bestselling novel solely for personal gain via going to the bookstore, determining what's already selling well, and slapping together a pastiche of it.