This was the final show taped for the series.
When the girl at the bar says to JJ, that her moon is in the seventh house, it's a line directly from the popular hit by the 5th Dimension, "The Age of Aquarius". The song was adapted from the huge Broadway hit musical Hair and stayed atop the Billboard Hot 100 for six weeks, eventually being certified platinum. In 1980, it ranked 66th on Billboard's list of Greatest Songs of All Time.
In this episode while at the club, JJ is a wearing the same suit from season 3 episode 19. Street hustler Sweet Daddy Williams was sponsoring JJ's art show and supplied JJ some really cool threads! At the end of that episode, SDW takes that suit back, including the refrigerator.