When Mary and Margaret appear together (both played by Loretta Young), Loretta's sister Polly Ann Young dubbed the voice for the other character.
The age difference between the romantic leads was 25 years. Loretta Young was 17 years old; Jack Mulhall was 42.
In September 1928, Warner Bros. Pictures purchased a majority interest in First National Pictures and from that point on, all "First National" productions were made under Warner Bros. control, even though the two companies continued to retain separate identities until the mid-1930s, after which time "A Warner Bros.-First National Picture" was often used.
A former Arrow Collar model, Jack Mulhall was born in 1887. He worked variously in an iron foundry, as a midway barker, vaudeville actor/dancer, was in Florenz Ziegfeld Jr. New York vaudeville shows before joining D.W. Griffith at Biograph Studio in the early 20th Century. He became a noted silent film star alongside Mary Pickford and others. In Dark Streets (1929), Mulhall played twin brothers in a similar plot to this film. He lost a fortune in the 1929 Wall Street Crash and continued acting until 1959, almost six decades in the cinema.
The engraved inscription on Mary's locket says "EACH TO EACH IS SPIRIT MATE WHEN IN DANGER TRUST TO FATE."