 They bicker constantly at work despite becoming increasingly attracted to each other.Garland introduced the Christmas song "Merry Christmas" in this film; it was later covered by Johnny Mathis, Bette Midler, and cabaret artist Connie Champagne.Director Robert Leonard originally hired Buster Keaton as a gag-writer to help him devise a way for a violin to get broken that would be both comic and plausible.