The Substitute teacher Dylan Keating (voiced by Adam Scott) has 2 of the Cones of Dunshire on his dresser and a farmer figurine - a nod to the board game created by Ben Wyatt of Parks and Recreation, also voiced by Adam Scott.
The name of the substitute teacher, Keating, may be a reference to the movie Dead Poet's Society. His telling the students to throw away their books is similar to a scene in the film where the students are told to rip out pages of their textbook.