This behind-the-scenes footage was taken by Charlie's half-brother, Sydney, during production of The Great Dictator. This is my edit of the original 26-minute footage which can be found on both the MK2 & Criterion DVD sets of the film.
Music: "The Great Dictator", from Charlie Chaplin: Essential Film Music, Carl Davis, conductor, & "Falling Star" from Oh! That Cello by Thomas Beckmann
Opening shot & .21: Charlie (in costume) behind the camera
2:30: Charlie loses his temper.
2:49: Assistant director, Wheeler Dryden, Charlie's half-brother (Dryden is also the voice of the translator, Heinrich Schtick, during Hynkel's speech)
3:02: Betty Chaplin (later Betty Chaplin Tetrick, Charlie's cousin), at left wearing a white blouse, and Syd's wife, Gypsy. They are seen again at the 5:33 mark.
4:17: Henry Bergman (Bergman is not in the film but has an uncredited role as assistant).
4:28: Charlie waves to his brother.
4:45: Syd's panning shot taken from the roof of the Chaplin Studio garage, note the Hollywood sign in the distance, the set from City Lights where Charlie assessed the nude statue (5:00), & the Chaplin studio gate (5:31).