The show Piper is watching on her bedroom TV is a soap opera called Passions. It ran from 1999-2008 The character on the screen is Tabitha and she was the town witch of Harmony.
When the doctor tells Piper why she fainted, she refers to her disease as toxemia. This disease is now most commonly referred to as Preeclampsia, which is characterized with high blood pressure and protein in the urine.
Kane Hodder, best known to fans as Jason Voorhees and Victor Crowley in the Hatchet series, has an uncredited cameo in this episode as one of the thugs in the pizza place that Phoebe and Paige go to meet Cronyn.
Cheryl Ladd and Richard Lynch had previously worked together when Lynch guest starred on "Charlie's Angels" (1976) {Angels on the Street (#4.7)}.