I was stunned by his ability to retell parts of
The Silmarillion. I read it once, and lemme tell ya, I need to read it again.
The Encyclopedia of Arda is a great source if you need to put pieces together and have questions answered, but the book itself is so dense with lore it's hard to hold it all.
I teach
The Lord of the Rings in my English 12 class. I thought about including
The Silmarillion in the reading, but rejected the idea almost immediately. I'd lose students (not all, but most, I think) rather quickly. It's more of a history-type text than a novel. I did, however, include as much of
The Silmarillion as I could, including the story of Beren and Luthien, Feanor's oath and his sons, the slaying of the Two Trees by Melkor and Ungoliant, the theft of the Silmarils (and the wars that followed), and the creation of Middle-earth itself (including the song, the gods, Valinor, the nature of Ainur and Maiar, etc. etc. etc.). Some students gobbled it up. Most rode the wave and mostly stuck to the text.
I wonder if Colbert brushed up for that little Tolkien bit or if he really does have
The Silmarillion almost memorized.