When talking about the possibility of vampires, Leo says, "Far as I know they're part of a whole different network now." The show, Buffy the Vampire Slayer, switched from The WB to UPN in 2001. Charmed was originally aired on The WB.
Michael Bailey Smith plays the Grimlock in this episode. He also was cast as 4 other different roles during the 8 seasons of Charmed...Shax, Janor, Balthazor and The Source.
Just after Rowan asks the Vampire Queen for permission to try and convince Paige to change sides, the camera pans to the Vampire Queen a little bit too low, exposing the fabric that is supposed to be covering up her chest.