Guest Stars Ryan Hansen as Dick Casablancas Kyle Gallner as Cassidy "Beaver" Casablancas Harry Hamlin as Aaron Echolls Lisa Thornhill as Celeste Kane Alona Tal as Meg Manning Erica Gimpel as Alicia Fennel Christopher B. Duncan as Clarence Wiedman Corinne Bohrer as Lianne Mars Kevin Sheridan as Sean Friedrich Leighton Meester as Carrie Bishop Sam Huntington as Luke Haldeman Jonathan Bennett as Casey Gant Jennifer Gareis as Cheyenne Daniel Bess as Cole Co Starring Carl Bresk as Teacher / Coach Preppernau Amanda Noret as Madison Sinclair Antonio Jaramillo as Waiter Billie Jones as Cindy Melissa Hoover as Shelly Pomroy