* The name "Nick" is possibly a reference to "Old Nick" which is a [http://en.wikipedia.org/wiki/Christian_teaching_about_the_Devil nickname for the Devil.]
* Nick's status was unclear following Lucifer's return to his body in [[12.13 Family Feud]] -- whether he remained alive after his first possession by Lucifer, had been resurrected to act as a vessel again, or whether or he was like [[Jimmy Novak]]: a dead vessel restored to act as a permanent vessel for their possessing angel. [[14.01 Stranger in a Strange Land]] confirms Nick was either still alive or was resurrected by Crowley.
* Nick being alive at the time of [[12.13 Family Feud]] makes it unclear how Lucifer was able to repossess him as it has been previously established that when an angel leaves their vessel, they need permission once again to reenter. At the time Lucifer reentered Nick, he was unconscious in a chair and did not appear to have consented. However, he may have been in a vegetative state, much like how [[Donnie Finnerman]] was shown to be catatonic in [[5.03 Free to Be You and Me]]. Angels also do not require verbal consent, as [[Gadreel]] was able to possess Sam through his subconscious. Another possible explanation is that when Lucifer left Nick's body, he left the door open a crack in his mind so that he could return at will as [[Michael (Apocalypse World)|Michael]] did with Dean as seen in [[14.09 The Spear]].
* During the scenes where he commits his murders, Nick takes no visible precautions to stop himself from leaving [[fingerprints]], even leaving the hammer which he has touched with his bare hand behind at [[Arty Nielson]]'s crime scene, which explains why his fingerprints could be used to identify him as the killer. The fact that they specifically identified Nick by name when Donna ran them suggests that Nick has some kind of criminal history that resulted in his fingerprints being on file, otherwise there would've been no reason for Donna to get a specific match on him.
* In [[14.12 Prophet and Loss]], its revealed that at least four different jurisdictions want to prosecute Nick for his crime spree. These presumably include Pike Creek, Delaware; Montauk, New York; and Grand Rapids, Michigan. Hibbing, Minnesota, may be another one, but Nick's crimes there only amounted to resisting arrest and assaulting a police officer. Another possibility is the location where Nick killed the demon that led him to Mary Winchester at the beginning of [[14.11 Damaged Goods]].
Nick also shares a similar mindset to [[ Jeffrey]] from [[ 7.15 Repo Man]] . Both men became serial killers after being possessed, Jeffrey by a demon and Nick by a fallen archangel. They also share a similar desire to be possessed again as they loved the power they had and both had radically changed due to separation anxiety.