Part 1 of 2. This 2015 biography of Walt Disney is impressive, and instructive, precisely because it doesn’t avoid or whitewash some of the more problematic parts of the great show-biz visionary’s personality and history. Quite the contrary: This American Experience two-part documentary, concluding next week, is fascinating, and worth watching as a rerun, because it addresses those issues, including his fights with the union and his tolerance for certain types of prejudice, directly. Check local listings.