Hitler was insane, amd truly thought his dog was his actual son.
I believe he may have been a drug addict; this is the only fact I'm not 100% on.
The hoolocaust was a gradual process, culminating in the concentration camps. First, the was the... Something sounding like the eistengruppen. Ey rode around on moter cycles in western Europe mahine gunning all the underisirable in the village. That wasn't effiecient enough, so they made gas vans, portable gas chambers. Only after the invasion were the concentration camps start to be built.
The Nazis knew they would lose by 1941, they kept fighting in hopes they could make peace with the allies and fight together against Russia.
Hitler remained friends with Musilini, even after Italy betrayed Germany.
Hitler thought Japan would win against America after Pearl Habor, so he declared war against America. One of his fatal mistakes.
Only destroyers were... Destroyed, during the attack. Modern naval warafare was based on aircraft carryers.
Hitler arrived several hours late to all his speaches, so when he finally came people would naturally be happy to see him (because hey, now we can go home and sit down)
All of our marketing techiniques are based off of nazi propoganda. All of them. Goebbels was a genius, fusing propoganda with entertainememt, so people didn't know they were being brain washed.
Trying to think of more random facts...
I'm done for now.