One of Charlie Chaplin's early movies casts him as a man who goes to a movie studio to find his dream girl, only to make a complete mess of the production. Watching "A Film Johnnie", I assumed that "Johnnie" refers to someone who makes a mess of things. Maybe it was a slang word at the time. Most importantly, the movie lets us see Chaplin strut his physical humor. I suspect that everyone had a lot of fun making it. In addition to Chaplin, there's Fatty Arbuckle and Mabel Normand. Not any kind of great movie, but fun for the few minutes that it lasts.
I bet that Charlie Chaplin felt weird having gone from poor boy to international superstar. To be certain, his granddaughter Oona played Talisa Maegyr on "Game of Thrones".