The Originals

Nathaniel Buzolic, the actor portraying the role of Kol Mikealson, auditioned and was almost cast as Stefan Salvatore in Crónicas vampíricas (2009).

Daniel Sharman played a werewolf in Teen Wolf (2011), and is now playing a witch. This is the opposite of Phoebe Tonkin, who played a witch on The Secret Circle (2011) and is now playing a werewolf.

Julie Plec initially intended to kill off Josh at the end of season 1, but the writers threatened to never forgive her if she did so.