Trivia: Orson Welles' line "...you know what the fellow said... In Italy for thirty years under the Borgias they had warfare, terror, murder, bloodshed - but they produced Michelangelo, Leonardo da Vinci, and the Renaissance. In Switzerland they had brotherly love, five hundred years of democracy and peace, and what did that produce? The cuckoo clock." was not in the script. Welles just wanted to say it, so he did, much to the anger of the original author. He thought it was a terrible piece of writing but it has turned out to be the most memorable line in the entire film.
Trivia: Maureen O'Hara (born 1920) was only six years older than Betty Lynn (born 1926), who played her daughter.
Trivia: When the Coyote is about to attack the Road Runner with an axe towards the end of the cartoon, look behind him and you can see a billboard saying "Jones Motel" - a reference to the Warner Brothers director Chuck Jones.
Trivia: Although they play mother and son, Agnes Moorehead was only 8 years older than James Stewart.
Trivia: Janet Leigh (born 1927), who plays Timmy Ennis' mother, Connie, was only fourteen years older than Gordon Gebert (born 1941).
Trivia: Bowery Bugs was the only cartoon starring Bugs Bunny directed by Arthur Davis.
Trivia: When the dog shoots his hand when trying to catch Reginald Fox at the log, part of "Tom's scream" can be heard.
Trivia: Mary Astor plays Marmee, the mother of Jo (June Allyson). In real life, Astor was only eleven years older than Allyson.
Trivia: Before Leopold (Bugs) begins conducting, he takes the conductor's baton and breaks it. Leopold Stokowski never conducted with a baton, so this is the reason why Bugs breaks it.
Trivia: When the baby woodpecker walks glumly away after being thrown out of Jerry's house, he goes over to Tom who is sitting in a deckchair. The magazine that Tom is reading has "Saturday Evening Puss" on the front cover, which would be used as the title for a 1950 Tom and Jerry short.
Trivia: When Tom is reading Jerry's diary, the flashbacks we see are clips from four previous Tom and Jerry shorts: "Tee for Two", "Mouse Trouble", "Solid Serenade" and "Yankee Doodle Mouse."
Trivia: When Bugs puts up his hand to fetch a taxi, there is a billboard saying "Try Friz The Wonder Soup" - a reference to the Warner Brothers director Friz Freleng.
Trivia: This was the first Warner Brothers cartoon to win the Academy Award for Best Animated Short Film.
Trivia: When Donald gets blasted by the log "cannon" at the end of the cartoon, a "Goofy Holler" can be heard.
Trivia: When we see Bugs telling the other cowboys about the acts for the vaudeville show, you can see behind him there is a poster for an act entitled "Frizby the Magician." This is a reference to the Warner Brothers director Friz Freleng.