Trivia: The "Sisters" comedy act was completely improvised by Bing Crosby and Danny Kaye.
Trivia: When Claude Cat flies up above the elevated train tracks, there is a sign in the background saying "Don Foster for Mayor." Foster was an artist who designed many of the lobby cards for Warner Brothers.
Trivia: When Hans arrives in America, he gives his cousin Willie some cheese. Hans then looks around and sees some traffic coming past. The traffic includes a pink lorry saying "Foster's Eggs" and a yellow lorry saying "Fritz Transfer Co." - a reference to the writer Warren Foster and director Friz Freleng, respectively.
