for trivia tropes related to the Peter Jackson film
- Breakthrough Hit: The success of The Hobbit encouraged J. R. R. Tolkien to write a much larger novel about Middle-Earth, which turned out to be his Magnum Opus The Lord of the Rings.
- Filk Song: Leonard Nimoy's "The Ballad of Bilbo Baggins".
- Recycled Script: In The History of the Hobbit it's pointed out that Thranduil the Elvenking and his hold in Mirkwood is closely derived from the original conception of Thingol of Doriath (Tinwelint of Aranor) — which also explains his distrust of dwarves. This isn't obvious to people who are only familiar with the published Silmarillion, because the final version made Thingol and Doriath much richer and less earthy and sylvan. However, Tolkien added a Discontinuity Nod to this when The Silmarillion does mention that Thranduil lived in Doriath in his youth and modelled his own kingdom in Mirkwood on it.
- Referenced By: The source code for Perl 5, which does quote The Lord of the Rings many times, also quotes The Hobbit once, at the top of numeric.c.
- What Could Have Been: The History of the Hobbit is full of these. For example, the first draft sets the story in the time of The Silmarillion, Bilbo mentions China at one point, and Beorn was originally called Medwed (Russian for "bear"). Gandalf's name was originally to be "Bladorthin", Thorin's name was originally to be "Gandalf", Smaug was to be "Pryftan", and Bilbo's working name was "Bingo Baggins". Plot-wise, the most drastic change was about Smaug; specifically, that Bilbo killed him instead of Bard. The first time Bilbo infiltrated Smaug's lair, he would stab him through the bare spot in his chest with Sting (which went so deep it vanished completely), and then ride a golden bowl on the stream of blood pouring out of Smaug's wound before triumphantly exiting the mountain.
- Hey, It's That Guy!: Plenty among the cast, including Brother Theodore (credited as just Theodore), John Huston, Otto Preminger, and Glenn Yarborough (sings "The Greatest Adventure"—he was later one of the West End Phantoms).
- Hey, It's That Voice!: Plenty among the cast, including Hans Conried, Don Messick, Paul Frees, Thurl Ravenscroft, and John Stephenson.