The original unaired pilot was filmed entirely on location at 1329 Carroll Avenue (the house used for all exterior shots and filming for 'Charmed'). Once the role of Phoebe was re-cast to Alyssa Milano, shooting for the interior shots of the house took place on a sound stage. One shot from the original unaired pilot does remain in the aired pilot - it is the shot of when the sister receive their powers and powerful blue lights radiate from the chandelier in the living room, this shot was filmed in the actual house on Carroll Avenue.
In the original pilot that was unaired, Phoebe was played by actress Lori Rom. After Lori left the project for personal reasons Alyssa Milano was re cast as Phoebe and all of the shots that stared Phoebe were re shot. Many of the shots from the pilot that did go to air were from the unaired pilot - these shots only featured Shannen Doherty and Holly Marie Combs. Shots with Alyssa or shots with all three actresses were re shot.
Inspector Andy Trudeau ask if the cat that Phoebe is holding was there and that it "Seems familiar." For three series Kit appeared on the show irregularly and was the witches "familiar". In folklore, familiar spirits (sometimes referred to simply as "familiars" or "animal guides") were believed to be supernatural entities that would assist witches in their practice of magic.