You could listen to the teacher in the beginning. Or notice the constant jingoistic propaganda. Or watch any voice of reason be shouted down.
To each their own but especially these days, it’s important to notice that the road to authoritarianism isn’t a wild swerve from thr status quo but a slow, gradual drift.
Personally, I quite enjoy a movie that respects its audience enough to not have to have the bad guys murder babies for a reasonable viewer to catch on to the what’s going on.
It was fine as a adumb tits n ass action movie when I was 12, realized “hey, this is an actual movie” in my 20s. And that’s fine, if it is somehow too subtle for people, well, so is authoritarianism.
Ironically, I’d imagine this is his best movie. Certainly the most grown up one. As far as I know, no explosions, almost certainly no cars flying off/through buildings etc. Just a drama for adults aka the kind of movie that hasn’t done well at the box office for the last quarter century or so.