When Cole finds Phoebe holding Ed Miller off the ledge of the building he owns, Cole says he received a phone call from one of the building occupants saying Wonder Woman was terrorizing their landlord. Jeannie Epper, who plays the elderly woman Piper and Paige save from being carjacked, was Lynda Carter's stunt double on Wonder Woman (1975).
Phoebe says: "Who was that masked man?" Which is a famous quote from the old TV show The Lone Ranger (1949).
Arnon (Mark Sheppard) goes after a teenager, Kevin (Andrew James Allen) with special powers. In the CW Series, Supernatural, Mark Sheppard acts as a Demon/the King of Hell, Crowley, and also goes after a teenager named Kevin, who also has a special power (a Prophet who can read the Leviathan tablet).
The Equinox that Remus talks about only happens on either the 22nd of September or the 20th of March so considering how they're dressed it must be the Fall Equinox not to mention when this episode was released as well.
It's revealed witches can become elders if they pass on their powers to them.