The animation of Mickey dancing with an enormous pig in "The Whoopee Party" from 1932 was reused from the 1930 Mickey Mouse Cartoon "The Shindig".
Goofy or Dippy Dawg makes his second appearance in "The Whoopee Party" from 1932. "The Whoopee Party" is also the first Cartoon, where he has a major role and is part of Mickey's gang.