Bradley Whitford is the celebrity caller in this episode. He plays Stu, whose afraid to give up his freedom when his girlfriend wants him to move in, get more serious.
In the opening scene, Frasier complains that there is no place for him at the Yo-Yo Ma Orchestral Fantasy Camp again this year. Yo-Yo Ma was a guest caller to Frasier's radio show in the sixth season episode Dr. Nora (1999)