[My brother Michael] remembered that I (then between four and five years old) was greatly concerned with petty consistency as the story unfolded, and that on one occasion I interrupted: ‘Last time, you said Bilbo’s front door was blue, and you said Thorin had a golden tassel on his hood, but you’ve just said that Bilbo’s front door was green and that Thorin’s hood was silver’, at which my father muttered ‘Damn the boy’, and then strode across the room to his desk to make a note.

— Christopher Tolkien, recalling a series of Christmas readings in the late 1920s in which The Hobbit took shape, quoted in Christina Scull and Wayne G. Hammond, The J.R.R. Tolkien Companion and Guide: Reader’s Guide, 2006