Diane Peterson, who plays Alex's (Judd Hirsch) girlfriend Peggy, is a stuntwoman in real life, which was essential to the role since she's knocked across Mario's restaurant, landing perfectly in Hirsch's arms.
Fans of the series would have to weather the incessant, throaty laughter of producer James L. Brooks, which can be heard louder than any other laughter, and is particularly audible in this episode, especially during the end scene between Alex and Louie.