Now I'm not talking about just one entertainment related thing (i.e. film) instead we're going into how pop culture in the United States and the Confederate States would be in a Confederate victory scenario.
Personally, I think that the both American and Confederate pop cultures in the rest of the 19th century, 20th century, and 21st century would be shaped a lot by the Civil War (or whatever it's called in TTL). Even some American and Confederate fictional works not about the war would have some allegories related to the conflict.
Of course not all American and Confederate entertainment would relate to the Civil War/whatever it's called there would be also be works from both countries that would focus on subjects other than simply the war there would be films, TV shows, novels, and video games that have nothing to do with the conflict.
American and Confederate pop culture fiction would also have different values and beliefs from each other based on their histories, traditions, and political beliefs/affiliations.
As for any Civil War/whatever it's called related works from America and the Confederacy they would different views as to what the war was about (for example: American-made films, TV shows, novels, and video games would be about slavery while Confederate-made films, TV shows, novels, and video games would be about states' rights).
Overall, in any Confederate victory scenario American and Confederate pop cultures will take very different courses shaped by the Civil War/whatever it's called and how their history progresses.