Brother actors Costas and Louis Mandylor play brother ghosts Rick and Nathan Lang in this episode.
The first episode where Paige uses her Whitelighter half to sense another Whitelighter.
Costas Mandylor (Rick Lang) and Holly Marie Combs (Piper) both previously starred together in the TV series Picket Fences (1992-1996).
At one point in the episode, the power shuts off at the manor. Phoebe's laptop shuts down even though the power cord had been plugged in for a while. The laptop should still hold a charge from the internal battery.