In this episode Prue creates the demon trap made of crystals which they use many times throughout the series
The shirt that Abby put on in the basement was the shirt that Prue had worn in the season 2 finale.
Both Boti Bliss (Abbey) and Eddie Cahill (Sean) would become part of the C.S.I Franchise; C.S.I: Miami and C.S.I: NY respectively.