When asked about her plans for the day, Debbie replies "A matinee, a Pinter play, perhaps a piece of Mahler." It is a quote from the song Ladies Who Lunch from Stephen Sondheim's musical Company.
When Emmett and Deb say, "Dignity, always dignity," and raise their index fingers, they are quoting Don Lockwood (Gene Kelly) in Singin' in the Rain.