You are using an out of date browser. It may not display this or other websites correctly. You should upgrade or use an alternative browser.
alternatehistory.com
Basically, have a major cultural classic, like Star Wars, be... realistic.
How realistic? Italian Neo-Realism levels. Make a film like Battle of Algiers as culturally popular as Star Wars, Star Trek, or Casablanca. I consider this an interesting idea because it would be rather... well, different than insanely popular movies.
Additionally, this is really hard, and I'm curious to whether this can actually be accomplished with a post-1900 POD.
Finally though, I'm very curious what impacts this would have on history, and cultural PODs like this I don't think are attempted enough.