When Cappie and the other KTs bust Dean Bowman, Dean Bowman steps out of his car and says "Excuse me, Sloan" to his date, referencing the character from Ferris Bueller's Day Off, in which he played the part of Cameron. He is also driving a red convertible much like the Ferrari in the movie.
While U-SAGS and the Greeks launch competing picket lines, Beaver forgets his pro-Greek chant and breaks into "Donna Martin graduates" - a reference to an episode where a demonstration is held on her behalf.