- Ability over Appearance: Idris Elba being cast as Roland in the film/TV adaptation. Since there is never any indication that Gilead has problems with racism, this probably won't affect the story, but Roland is also described in the books as looking like a young Clint Eastwood. Stephen King has given Elba his blessing in the role.
- Real Life Writes the Plot: Stephen King was run over and almost killed by a van between writing the fourth and fifth books. This winds up being very important in the story, foreshadowed through the fifth and sixth books and seen in the seventh, where Roland's ka-tet are directly responsible for his survival.
- The word "slughorn" used in the original poem "Childe Roland to the Dark Tower Came" is actually a medieval word for "slogan," meaning "battlecry." Browning used it to mean an actual horn after reading the 18th century poetry of Thomas Chatterton, who seemed to believe that the word indicates a musical instrument. This is a little ironic given the end of the Dark Tower series, in which Roland cries out his arrival, but discovers that he needed to have a horn.
Trivia / The Dark Tower
Put The Dark Tower-related trivia here.