Not terribly compelling but interesting for Welles and Kane buffs, RKO 281 (the production number of Citizen Kane during filming) dramatizes the ups and downs of a brash Orson Welles and his clash with William Randolph Hearst, the man on whom Kane was based. RKO 281 adds little to the Kane mythology, though the real origin of 'Rosebud' is something I'll always cherish.
See also The Battle Over Citizen Kane for the straight documentary version.
Rosebud...