Halliwell Manor is identified as the location of Phoebe's birth.
First time that one of the Charmed Ones (Phoebe) adds a spell to the Book of Shadows.
This was the first time that the shadow of the Nexus appears. It would later become a target for many of the demons as a way to gain ultimate power.
The title is based upon the cliché expression, "Is there a doctor in the house" usually used during a medical emergency in a crowded room.