Walt Disney: The Triumph of the American Imagination
In one sentence: Neal Gabler's 2006 biography, written by the only author ever granted full access to the Disney company archives, is the book David thanks first thing in the episode as "my main source for facts and Walt quotes."
Overview
Walt Disney: The Triumph of the American Imagination was published by Alfred A. Knopf in 2006. Gabler got archival access no outside biographer had received before or since, and used it to rebuild Walt's life end to end: two early bankruptcies, the bet-the-company gamble on Snow White, the 1941 animators' strike, and his postwar testimony before the House Un-American Activities Committee. Two of the book's judgment calls carry directly into the episode. One is Gabler's conclusion, after thorough research, that there's no real evidence Walt was antisemitic, despite the accusations that followed his HUAC testimony. The other is a quieter revision of the Mickey Mouse origin story: Walt's standard telling for decades was that his wife Lillian talked him out of naming the character Mortimer in favor of Mickey, but Gabler's research points instead to Ub Iwerks as the one who most likely drew the first version of the mouse. Gabler also describes the scale of Snow White's production, two million sketches and 250,000 finished cels, with the comparison that making it was "like building a Gothic cathedral."
Why It's Recommended
David opens the episode by calling this "my main source for facts and Walt quotes," and notes Gabler was the only author with full access to the Disney archives. The hosts lean on the book's own judgment calls more than once: when the antisemitism accusations come up, they defer to Gabler's conclusion that there's no real evidence for them; when they tell the Mickey origin story, they go with the version Gabler's research supports rather than the one Walt told for years. This isn't a book cited for a stray quote here and there; it's the backbone the episode's characterization and fact-checking are built on.
Source
The primary source for Disney: Walt's Era (1901-1971): Walt's early life, the details of both bankruptcies, the "Gothic cathedral" comparison for Snow White's scale, the alternate account of who first drew Mickey, and the conclusion on the antisemitism accusations are all drawn from or corroborated by this book.