On streams I've seen the USSR have multiple civil wars, because apparently the focus tree gets reset after the civil war, which really hampers the USSR. Germany also seems to end up with ridiculous amounts of industry and can actually win two front wars against half the world. I haven't seen the AI oppose Hitler yet, but I did see Austria join the Pact of Rome with Hungary and Italy, and refuse Anschluss, which caused the Czechs to refuse Sudetenland (since Germany was still trying to conquer Austria) and trigger the crisis (not sure if that requires the UK to side with Czechoslovakia but I think it does, maybe tied to world tension?) which caused a Democratic revolution that joined the Allies.
And when I played as Germany and got the Kaiserin, Japan tried to go Communist but couldn't take Tokyo to finish the Civil War. I hadn't even realized Japan could go Communist.