Trivia

'Metamorphosis' (2008) is the last episode Kim Manners directed in Supernatural (2005) before his passing from lung cancer on 25th January 2009.

This is the first time Dean refers to Castiel as "Cas".

Carthage, Missouri is also the setting for the series 5 episode Abandon All Hope (2009).

A rugaru/rougarou also appears in the Haven episode Shot in the Dark (2013).