Heart of Fire
- Few of the first lines of "Gone" are sung in the third chapter.
- Smaug calls Kathryn his angel of the night in the epilogue.
Heart of Ashes
- Vathvael's politics have references to Game of Thrones.
- Some of the last defiant words Kathryn gives Lord Beronor are like the ones Queen Elizabeth gives Don Guerau De Spes.
- The telepathic proclamation Smaug gives to Vathvael's people, as well as his ultimatum to Kathryn and some of his words are borrowed from Harry Potter and the Deathly Hallows.
- Smaug gives Andraya a Pre-Mortem One-Liner that's similar to the one Khan gives Admiral Marcus.
Heart of the Inferno
- The title of the 9th chapter comes from the And death shall have no dominion poem, inspired by Beauty and the Beast (1987), and dedicated to the series' two-part episode "Though Lovers Be Lost…".
- The title of the 11th chapter is inspired by Bonnie 'Prince' Billy's song "The Dragon Song" from Pete's Dragon.
- Kathryn tells Aragorn in the 12th chapter that "We cannot choose whom we love."
- Urgost from War in the North appears as an honourable mention of the game.
- Faervel and Smaug's debate in the 15th chapter is inspired by the negotiations Spock and Khan engage in during the climax of Star Trek Into Darkness, as a nod to the shared actor of Smaug and Khan.
