Mack and Mabel doesn't go into the 20's all that much - if you're going by historical facts, anyhow. Keystone was started in 1912. Mabel left the studio in 1916. The WDT murder was in 1922. Then it seems to jump directly to 1930, Mabel's death.
I don't consider Mabel an actress of the 20's; the WDT murder was the beginning of the end of her career, although she certainly held on as long as she possibly could.
Don't mind me; I just love Mabel Normand and the silents.
I'm not exactly sure about "Nick & Nora," but it very well could've taken place in the 20's.
Now she's peddling the news along Broadway I'm a rat and a chisler, and of course all the rats and chislers believe her.
~Hughie, Eugene O'Neill