'''[[2.17 Heart]]'''
Heart is the name of [ https://en.wikipedia.org/wiki/Heart_(band)a rock band] that became famous circa 1975 for singles such as [https://en.wikipedia.org/wiki/Crazy_on_You Crazy on You] and [https://en.wikipedia.org/wiki/Magic_Man Magic Man]. "Heart" is also a direct reference to a plot element of this episode: namely the missing hearts of werewolf victims. "Heart" may also be a reference to the Sam's feelings in this episode for [[Madison]].
'''[[2.18 Hollywood Babylon]]'''
'''[[13.12 Various & Sundry Villains]]'''<br>
"Sundry" means various, particularly small and not fit to be mentioned individually. As writer [[Steve Yockey]] has a history of giving exactly those type of characters their own name in the episode title, it stands out here that this time he chose not to do so, most likely because while he did create his own self-contained characters of the Plum sister witches, in this episode , he is also writing two much larger, recurring villains for the first time: [[Lucifer]] and [[Rowena]].[[File:thething1950.jpg|thumbnail|Poster for the 1951 horror film]]
'''[[13.13 Devil's Bargain]]'''<br>
A "devil's bargain" is an idiom for a deal that both parties know is wrong, but they agree to anyway because they feel they have no other option for success. In this episode, [[Sister Jo]] makes a deal with the actual devil [[Lucifer]] to keep herself alive.
'''[[13.20 Unfinished Business]]'''<br>
In addition to being a popular title for [https://en.wikipedia.org/wiki/Unfinished_Business multiple music albums and films], "the family business" is a common theme in Supernatural, often quoted by the Winchesters in regards to hunting, and to their family identity. In this episode, [[Gabriel]] confronts his own unfinished business: with Loki's family.
'''[[13.21 Beat the Devil]]'''<br>
'''[[14.02 Gods and Monsters]]'''<br>
The title of this episode originates as a quote from the 1935 movie [https://en.wikipedia.org/wiki/Bride_of_Frankenstein Bride of Frankenstein] in which Dr. Pretorius toasts, "To a new world of gods and monsters!" The title was also used for the [https://en.wikipedia.org/wiki/Gods_and_Monsters_(film) 1998 fictionalized biography] of the film's director. [[Michael]] is the self-proclaimed "god" of this episode, and he's rallying the monsters of the world against humanity.
'''[[14.03 The Scar]]'''<br>
Dean finds an inexplicable scar on his shoulder in this episode, and has to find out the source of it.
'''[[14.04 Mint Condition]]'''<br>
Collectible items are often rated on a scale as to their condition, or how close they are to new. "Mint condition" comes from the collection of coins, where the coins originated from a [https://en.wikipedia.org/wiki/Mint_(facility) mint]. Therefore, "mint condition" means the coin is brand new. This rating system is also popularly used for comics and action figures, as seen in this episode. "Mint Condition" is also the name of [https://en.wikipedia.org/wiki/Mint_Condition an American R&B band].
'''[[14.05 Nightmare Logic]]'''<br>
[https://en.wikipedia.org/wiki/Nightmare_Logic Nightmare Logic] is the name of the second album by thrash metal band Power Trip. The [[djinn]] in this episode describes what [[Michael]]'s enhancements have done for him, and the [[Nightmare Creatures]] he can create: "I read minds, see nightmares. And because of him, because of you, I can bring those nightmares into the world -- make them do whatever I want."
'''[[14.06 Optimism]]'''<br>