Trivia: When the animators where drawing Lucifer the cat they just couldn't get it right. Then when Walt Disney saw the animator Ward Kimball's cat, a furry calico, he declared "There's your Lucifer."
Trivia: All twelve children were never alive at one time. Mary, along with some of her siblings, came down with diphtheria, in 1912. While the others recovered, Mary died on January 31st. The family continued to refer to the Dozen, even though all twelve were never contemporaries. The book refers to them as a dozen, and the movie & stage play portrays all 12 at a time.
Trivia: After Sylvester has swallowed the bowling ball, he goes back down the drainpipe and out into the street. When this happens, look behind him and you can see a sign saying "Drink Friz! Six Delicious Flavors" - a reference to the director Friz Freleng. There is also a building with "Champin's 5 and 10" on it - a reference to the animator Ken Champin.
Trivia: Bugs' line of "Eh, next!" at the very end of the cartoon is the only spoken line of dialogue. The rest of both his and Elmer Fudd's lines are all sung.
Trivia: When Jerry phones the club and informs Mammy Two-Shoes about the party, she runs back home. You can see Mammy Two-Shoes' face for about two frames as she runs back to the house.
Trivia: When Prissy arrives at the grocery store to see if her egg has been delivered there, there is "Foster's Fresh Eggs" on the window - a reference to the Warner Brothers story writer Warren Foster.
Trivia: When we see the train during the opening credits, look at the carriages and you can see they have names of Warner Brothers staff on them: "Frizby" (Friz Freleng), "Hawley" (Hawley Pratt), "Ross" (Virgil Ross) and "Champin" (Ken Champin).
Trivia: This was Walt Disney's first completely live-action film.
Trivia: Mel Blanc, not Arthur Q. Bryan, voices Elmer Fudd's brief appearance.