Bugs characteristically kisses his nemesis, Yosemite Scrooge, early on.
The carolers include WB cast members Elmer Fudd, Foghorn Leghorn, and Pepe Le Pew...and Bugs.
Sylvester the cat appears as Yosemite Scrooge's pet. This, and the 1997 animated film version of the Dickens story, are the only times Scrooge is seen with an animal companion.