Erica wanted a dress for the prom and instead of buying an expensive dress, Murray Goldberg says "Or you could grab some of the old dresses in your closet, cut 'em up and make a new one in the current style. Like that movie... with the girl with the face." This is reference to the movie Pretty In Pink which came out in 1986.
The show was supposed to be in the 80's. White Diamonds didn't come out until 1991.
Adam's tees: The Karate Kid