The scariest thing about is the movie is the total lack of knowable information about the state of world. The only things we know about Oceania and "the war" are shown as propaganda.
Oceania might occupy far less geographic territory than what is officially said, or far more.
It may be part of a secret world government that controls each super nation (the entire world) and stages war to maintain control.
We don't know if there actually is a war or not.
We don't know specifically how the government became the way it did.
We don't know who controls the government.
There is no way to obtain verifiable information on any of these issues.
This is what happens when government secrecy escalates.