Crazy credits for
The Producers (2005) More at IMDbPro »

• Showgirls from Bloom's dream sequence during the accounting office
  number dance around some of the closing credits.
• For the closing credits, Will Ferrell (in the character of Franz
  Liebkind) recorded "The Hop-Clop Goes On" - a slower version of "Der
  Guten Tag Hop-Clop" that parodies "My Heart Will Go On" from "Titanic"
  right down to the cheesy instrumentals. At the end of the song, Franz
  whispers to the audience: "Don't forget to purchase 'Mein Kampf' in
  paperback. You can find it at Borders... or Barnes and Noble...und
  Amazon.com"
• After the credits finish, cast members from the film (including a cameo by
  Mel Brooks) sing the number "Goodbye!", which is sung in the stage version
  at the conclusion of the curtain call.

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