Very interesting - thanks so much for the link to the article, jimbo.
It confirms some of the things we've suspected (Cooper's cameo takes place during the masquerade ball) as well as adding details (Barnabas hires him (no doubt because he's become close with Carolyn)). The article would also seem to give another clue that there may not be an Old House in the film because we've been lead to believe the ball supposedly takes place at Collinwood and the article says Cooper is hired to play at Barnabas' home.
Also, now I'm really wondering where brittonlowe/Chris L read Cooper performs "Addams Family Groove" in the film when this article says he performs “No More Mr. Nice Guy”.
198 days 4 hours 33 minutes 23 seconds until the day the Depp/Burton Dark Shadows is released(ET)!!