The bug-eyed version looks like a deep fake...

Dexedrine, my opinion. I thought they were giving him amphetamines, low dose. Way back early he would flub a speech, then later he'd read the teleprompter very effectively. It looked like amphetamine, or atomoxetine. Hitler's doctor used to inject him with dextroamphetamine sulfate (Vitamin Forte) in the morning and phenobarbitol sodium for bedtime. That's why Hitler's hands shook, he may have developed Parkinson's from all the intravenous amphetamine. In old news reels you can see him holding on to his hands to prevent the shaking. This may be why Hitler was militarily stupid and invaded Russia.