John Pyper-Ferguson has an affinity for playing cult leaders in a number of criminal procedure shows: criminal minds, CSI, Bones to name a few.
Brenden Hines [Eli Loker] and James Marsters [Jay Pollack] appeared in the same Angel episode: Harm's Way where Brenden played another character named Eli.
Jon Pyper Ferguson (the cult leader) and Brendan Hines (Eli Loker) both went on to star in Suits (2011) as recurring characters.