The character of Scat Cat was designed to be voiced by Louis Armstrong. The character's look was modeled after Armstrong - the way he played his trumpet, his roly-poly physique, right down to the prominent gap between his teeth. However, at the last moment, for unknown reasons, Armstong quit the film without recording a single line. His replacement, Scatman Crothers, was directed to "Pretend you're Satchmo."
The Sherman Brothers (Richard M. Sherman & Robert B. Sherman), whose father wrote the big Chevaliar hit "Living in the Sunlight, Loving in the Moonlight", talked Maurice Chevalier out of retirement to sing the title song.
The character of Uncle Waldo, the English goose, was the last role of voice actor Bill Thompson, who died from a heart attack at age 58, shortly after the film was released.
Thurl Ravenscroft, the voice of Russian Cat, did singing voices on several Disneyland attractions such as Pirates of the Caribbean, Haunted Mansion, and the Enchanted Tiki Room. He was primarily known for many years as the voice of Kellogg's Tony the Tiger.
The goose sisters, Abigail and Amelia, are voiced by Carole Shelley and Monica Evans, who played the equally-chatty Pigeon sisters, Cecily and Gwendolyn, in the movie, TV series, and original Broadway production of Neil Simon's The Odd Couple. (They also provide the voices of Maid Marian and Lady Cluck in Disney's Robin Hood).
The dogs Napoleon and Lafayette are both named after famous french generals Napoleon Bonaparte and Marquis De Lafayette. Napoleon was the emperor of French who conquer much of Europe. Lafayette was a french nobleman who helped the Americans during the American revolution.