Continuity mistake: When Von Stauffenberg is coming home for the first time, Nina and Claus are kissing each other down the hallway. Nina's head moves the other way when the camera changes perspective. (00:21:10)
Continuity mistake: When Colonel Claus von Stauffenberg is handing Adolph Hitler the amended Valkyrie folder to approve, Hitler reaches for it with his right hand as the movie switches to a wider shot, the passing of the folder is going into Hitler's left hand. (00:40:45)
Continuity mistake: On the morning of July 20, Stauffenberg cuts himself while shaving, leaving a noticeable mark on his neck. After he arms the bomb at the Wolf's Lair, the cut disappears. (01:02:40 - 01:06:15)
Answer: Hitler was fanatically anti-tobacco: https://www.theatlantic.com/health/archive/2014/07/the-nazis-forgotten-anti-smoking-campaign/373766/.
Brian Katcher