When Henry is watching the YouTube video of Walter beating up Mad Milton's father, he is logged on to the same account (Eddie's account) that the video was uploaded from.
When Walter tells Sister Francesca that he'll "do anything to help" the orphanage after the fire, he has tears in his eyes and his hands clasped together in front of him. In the next shot, his eyes are dry and his hands are at his sides.
There are a couple of fights where you can see that the fighter doesn't come close to actually hitting his opponent. One in particular is when the Eddie and Walter are watching a fighter kick his opponent, who drops even though one can cleanly see the kick wasn't even close to his head.