The music in the HMS Yakko segment is derived from Gilbert and Sullivan's opera H.M.S. Pinnafore.
Yakko's Universe song is based on the "Galaxy Song" from Monty Python's The Meaning of Life (1983).
According to Jon McClenahan, John Williamson was an uncredited animator on the "Slappy Goes Walnuts" segment; he animates the classic Slappy cartoon at the beginning.
During the music number with the pirate captain while the warners are going below decks, a post is engraved with "Mel is a Meany"