In this film, Frank Sinatra introduced the now standard "Time After Time", which charted at #17 in 1947. It was later re recorded, by Frank, in 1959 as the B side to "French Foreign Legion". In 1960, Frankie Ford's rendition of the song charted at #75 US. Interestingly, that version fared much better than all, in Brooklyn, reaching NYC's Top 10. In 1966, Chris Montez' version peaked at #36 US.
Piano music was played by unseen 17-year-old André Previn, who had joined MGM's music department not long before this movie was made.
Throughout Frank Sinatra's early career much was made of the fact that he was very skinny. They make a little fun of his weight in this movie. During the song "I Believe" in the gym Frank walks up a teeter-totter and, when he reaches the high end, it remains up until 'Jimmy Durante' tosses him a baseball. When he catches the baseball the high end descends, implying that the baseball weighed more than Frank.