Something that I don't think has been mentioned:

In 1922, actor Lon Chaney starred in a film called Shadows. He was in yellowface, playing a character called Yen Sin.

According to a Chaney biography by Michael F. Blake, Shadows was originally supposed to be titled Ching Ching Chinaman, and sheet music of the song was issued, viewable here. Music was credited to Louis F. Gottschalk, lyrics by Eve Unsell.

Note that while Chaney played Yen Sin, it says on the sheet music cover:

Lon Chaney as Ching Ching Chinaman in the Screen Production "Shadows".


Jay