Best short movie trivia of 1951

Trivia: When Sylvester opens the letter box, he sees a milk bottle with a note in it. The note is signed by "Mrs. Champin" - a reference to the Looney Tunes animator Ken Champin.

Trivia: When we see the parade for the newly elected mayor, look in the background and you can see a building with "P. Julian" on it - a reference to the Warner Brothers background artist Paul Julian.

Trivia: When Butch is looking at the "Lost and Found" ads in the newspaper, some of the ads have names of Warner Brothers staff: "Vaughan" (Lloyd Vaughan), "K. Harris" (Ken Harris) and "C.M. Jones" (Chuck Jones).

Trivia: When Sylvester is looking in the ship's medicine cabinet, there is a bottle on the shelf called "Hawley and Pratt Salts" - a reference to the Looney Tunes layout artist, Hawley Pratt.

Trivia: When Sylvester hits the orange cat on the head with a mallet, look in the background and you can see a box with text printed on it advertising "Friz - America's Favorite Gelatin Dessert" - a reference to the director Friz Freleng.

Trivia: When Elmer turns around and finds an elephant behind him, the elephant says, "I'll give you such a pinch." This was one of the catchphrases of Stinky, Joe Besser's juvenile character on The Abbott and Costello Show.