 The end credits of season finales show greyscale headshots of celebrities who had "called in" that season.Celebrities providing voices as callers include Gillian Anderson, Kevin Bacon, Halle Berry, Mel Brooks, Cindy Crawford, Billy Crystal, Phil Donahue, David Duchovny, Hilary Duff, Olympia Dukakis, Carrie Fisher, Jodie Foster, Art Garfunkel, Linda Hamilton, Daryl Hannah, Ron Howard, Eric Idle, Jay Leno, Laura Linney, John Lithgow, Yo-Yo Ma, William H. Macy, Henry Mancini, Reba McEntire, Helen Mirren, Estelle Parsons, Freddie Prinze, Jr., Christopher Reeve, Carly Simon, Gary Sinise, Mary Steenburgen, Ben Stiller, Marlo Thomas, Lily Tomlin, and Eddie Van Halen.Some "callers" also guest-starred, such as Parsons and Linney, who played Frasier's final love interest in the last season.