Screenwriter Julius J. Epstein first arrived in Hollywood about 10:30 p.m. on October 14, 1933 and by midnight was collaborating on the screenplay of Twenty Million Sweethearts (1934) as pages had to be turned in early Monday morning.
Dick O'Brien enters the movie as a singing waiter who croons a version of "The Man on the Flying Trapeze" that is remarkably close to the version featured in the Oscar®-winning, Sucedió una noche (1934).
Twenty Million Sweethearts (1934) features the well-known song "I'll String Along with You" by Harry Warren and Al Dubin.
A remake entitled Mi sueño eres tú (1949) was filmed by Warner Bros. in 1949 with Doris Day and directed by Michael Curtiz.
Before its release, Twenty Million Sweethearts (1934) was entitled "Rhythm in the Air," "On the Air" and "Hot Air."