Erin Karpluk who plays Robin in this episode also appeared in Season 1 episode 21 as Monica the mother of the 6 month old baby.
Karin Konoval, the actress who plays Ruth, first appeared in season 4 episode 11 (Family Remains) as Mrs. Curry (the housekeeper who found the first victim).
Dylan Everett (Young Dean) has dark brown eyes while Jensen Ackles (Dean) has light green eyes.
Dean tells Timmy, "Give me your best kung fu grip." He's referring to the soft plastic hands of the GI Joe from the 1970's Adventure Team series that allowed the action figure to tightly grip his weapons.
Tom McBeath who plays Jack, the first killed in this episode, also appeared in Season 2 episode 10 "Hunted" as Mr. Carey.