It is an amazing movie. The oft-parodied bunker scene is bone-chilling when you realize what it really was - they realize that they’re trapped in a bunker with an unstoppable enemy steamroller coming their way on the outside and a madman on the inside, and there’s no escape. Can’t say they didn’t have it coming, but that’s scary.
It’s supposed to be the situation briefing of April 22, 1945, as best as can be reconstructed from witness accounts. What made it “special” was not Hitler’s tantrum (not unusual behavior for him) but that he admitted to his inner circle, for the first time, that the war was lost.