Given that the episode #4.15 spends considerable time five years in the past (before the series first aired), it closes with a nod to the pre-pilot name for the show with the principal cast members singing "My Girl".
The show was originally written with Max living in the same apartment as Khadijah, Synclaire, and Regine. However, she was moved prior to the production of the show. Max's reason for moving out was shown during this episode as her and Regine note being able to get along.