Up until this point, Holly Marie Combs' real life pregnancy was carefully hidden. However, this is the first time where it really is acknowledged. Also, to explain how Piper was now fully pregnant after just finding out in the previous episode the writers set this episode six months after the events in the previous episode.
Paula tells Phoebe she'll always be "Freebie" to her high school cohort. Prue first reminded Phoebe of this unfortunate nickname in episode 1x21 ("Love Hurts").
All four Halliwell sisters had bangs when they were teenagers.
The title makes reference to the novel "The Strange Case of Dr Jekyll and Mr Hyde" by Robert Louis Stevenson.
Paige mentions the film Carrie, Rose McGowan appeared in the 1999 comedy Jawbreaker that was a spoof of Carrie.