This episode is set in a standard fantasy setting of Springfield, the Kingdom of Springfieldia which largely spoofs multiple fantasy series such as The Hobbit, Game of Thrones, and C. S. Lewis and J. K. Rowling's works.
- Actor Allusion: Nikolaj Coster-Waldau cameos as Marge's twin brother who has incestuous feelings for Marge. Nikolaj plays Jaime Lannister in Game of Thrones where he is in an incestuous affair with his twin sister.
- Affectionate Parody: Of various fantasy stories and tropes.
- Alien Space Bats: It's implied the setting would have become our world if the dragon had stayed dead.
- Artistic License History: The Simpsons are supposedly serfs in the fantasy setting but we see them move around on their own in their spare time. In history, the lack of any freedom of mobility was the defining feature of serfdom.
- Ban on Magic: King Mitothin forbids magic by mages who are not serving him. Those who aren't serving him are essentially drafted.
- The Cameo:
- The long-retired Troy McClure appears as one of the victims of King Mitothin's beheadings.
- A caricature of George R. R. Martin is seen walking with a sandwich board that declares that "The end is not nigh until I say it is".
- Cessation of Existence: In a scene where several characters argue about what the afterlife is like, Bart raises the possibility that there is no life after death and that people who die just stop existing.
- Comically Missing the Point:
- One scene features several heads on pikes. Lisa complains that the upper class people get the best pikes.
- When the peasants wonder how to get into the castle, a group of Ent expys offer their assistance. The peasants choose to kill them and spend hours making their remains into ladders. When one says they could have easily broken down the castle gates by themselves in minutes, Homer tells the talking tree that trees can't talk.
- Face Death with Dignity: Mrs. Bouvier. Throughout the episode, she shows no problem at all with her deadly magical illness, only choosing to continue living because Marge wanted her to. In the end, she realizes that she can't go through with it and convinces Marge to let her pass on, in this case, by performing a heroic sacrifice against the dragon.Mrs. Bouvier: It's time for me to...go. Life is about moving forward. Girls want to be women, women want to be mothers, mothers want to be grandmas and grandmas want to know what comes next...
Marge: But what if I'm not ready?
Mrs. Bouvier: I wouldn't leave you if I didn't know you'd be alright!
Marge: Okay mom. I understand. (they hug)
Mrs. Bouvier: Maybe I was born a peasant, but I'm going out an ice queen!
- Girl in the Tower: Lisa by the episode's climax becomes this.
- Heroic Sacrifice: Mrs. Bouvier saves everyone by succumbing to her deadly ice illness—she gets completely encased in magical ice which shields her from Smaug's fire, slowly enters his mouth and shatters, freezing Smaug's insides and killing him temporarily.
- It's All About Me: Marge is basically alone in wanting Jaqueline to stay alive. Even the hag herself would rather just pass peacefully than cling to life.
- Jerk Ass Has A Point: Marge is right to be pissed with Homer for not helping her get Jacqueline back like he was supposed to.
- Knocking on Heathens' Door: Aslan goes around knocking on doors to spread the "Good News".
- The Magic Goes Away: At the end of the episode, Mrs. Bouvier's Heroic Sacrifice consequently removes all the magic in the world. Rather than let Lisa's suggestion to redefine the world with science be heeded, Homer (obviously not wanting to put any of the work in) restores the status quo by reigniting the dragon's flame, which resurrects it.
- Mutant Draft Board: King Mitothin demands all mages serve him, which causes Lisa to be arrested by his mage minions when she's found as having magic. This is what sparks the revolt at the end.
- You Keep Using That Word: Lisa transmuting lead into gold is repeatedly referred to as "magic", "witchcraft" and "sorcery". Nowhere is the word "alchemy" (the more accurate phrasing for such a feat) uttered.