- First movie with audible dialogue.
- George Jessel, star of the stage version, was asked to play the role in the film, but refused. Eddie Cantor was also asked, and also refused.
- Synchronized sound is used only for a few scenes containing songs. Spoken dialogue, such as the famous line "You ain't heard nothing yet," occurs only immediately after songs. All other dialogue, even including offstage dialogue during one song, is displayed on intertitles as usual for silent movies.
- Al Jolsen's famous line "you ain't heard nothin' yet" was an adlib. The intention was that the film should only have synchronized music, not speech, but Jolsen dropped in the line (which he used in his stage act) after the song "Dirty Hands, Dirty Face". The director wisely left it in.
- Not wanting to risk losing the disks, Warner Bros. had all of the Vitaphone sound for the film transferred to optical tracks on the side of the film itself in the 1930s.
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