Since we've already linked Reservoir Dogs to Pulp Fiction, this means that almost every movie Tarantino has done is set in the Inglourious Basterds timeline. We could go even further and link all the rest through Tarantino's fake brands, like those
Red Apple cigarettes that appear in a lot of his movies (including Kill Bill).
It makes a sort of sense when you think about it -- the world would be a very different place if Inglourious Basterds was historically accurate and everyone knew that the Nazis were defeated not through strategy and air power, but by sending a handful of pissed-off guys to [shoot hitler in the face]
If that's what you're taught in school, it's only natural that people should become desensitized to violence -- for some, shooting someone in the face would be something you could do as you're, say, making small talk about what type of hamburgers they have in Amsterdam.
Also, the fact that the Nazi high command was gunned down and/or burned alive during a hijacked film premiere would perhaps cause society to lend more importance to pop culture: It's no coincidence that the son of the man who killed Hitler in a movie theater went on to become an important film industry figure. If people constantly stop to talk about comic book characters or '70s rock music trivia during incongruous moments, that's because in this reality that's some important, history-changing shit.