2. He draws math formulas on everything
I love any scene in a movie or TV show where people open boxes, look over spreadsheets, and draw formulas on the walls. Unfortunately, The Accountant is short on actual accounting -- Affleck's character, Christian Wolff, is too busy running from a shady robotics company -- but there is one dynamite scene where Affleck gets to flex his dry-erase marker skills, and it's masterful. Suck it, Will Hunting.
3. He beats his leg with a wooden stick while listening to scary techno
The Accountant is eight movies crammed into one. None of them is very good, but one of them is a very earnest film about autism, like Rain Man with assault rifles. But one of the ways Affleck combats his disorder is by listening to very scary techno and hitting his leg with a big wooden stick while lights flash in his bedroom. Whatever works, man. At least he's not gambling!