In one of the early songs, the lyrics mention the foxtrot. This dance was named after Harry Fox, a Vaudeville star credited with inventing the dance.
The Dolly Sisters retired from show business in 1929.
The real-life Dolly Sisters appeared in the "Ziegfeld Follies" of 1911 and 1912, their only appearances on Broadway.
The Dolly Sisters were twins, born on October 25, 1892 in Budapest. In this film, the sisters are a year apart in age.