His eyebrows
I realize Anthony Michael Hall is very fair but in several episodes, they darkened his eyebrows to a ridiculous extreme and it's very distracting. He looks much better with his natural blond eyebrows.
It's weird watching him perform as an adult, I can still see him in my mind's eye as the skinny little kid with the over-sized head from his 80s movies. He grew up to be surprisingly handsome.