and his mouth drew in to 1/2 its normal size.
^^^^
That was very revealing to me. He has always appeared on camera talking with his mouth in the "e", or smiling position. He was so angry that he lost control of that ability. It was the first time that I can recall of seeing his mouth in the "oo" position. And you are correct. It got tiny. (I find everything about the man repulsive, and that tiny mouth was no exception.) Creepy!
I'm glad (in a way) that I wasn't alon in noticing his "butt mouth" as Crawdad put it. Guess that's an indication of some type of disgust / anxiety / anger of sorts?
The thing I noticed was his left eye. It didn't open properly. It almost looked swollen. I wonder if it didn't open correctly as a result of some medical condition.