By Word of Mouse (1954)

Continuity mistake: The lighter that burns Sylvester's whiskers wasn't there when he opened the drawer of the filing cabinet.

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.