I'm no expert, but I sometimes play one on this forum. Thoughts so far:
McCourty's endzone breakup at the end of the first drive was pass interference.
Arrington's pass breakup that resulted in Tavon Wilson's interception probably should have resulted in pass interference. He impeded the receiver's path, which is why Washington had to jump lunge at the end. If their roles had been reversed, and Washington had been behind Arrington and pushed off him like that, this board would be livid.
Tavon Wilson was probably completely out of position on that play. It appeared the Patriots were in Cover 3, Arrington obviously on the deep left, Gregory deep right, Devin McCourty right flat, and Tavon Wilson, who started in the slot, drifted backwards at the snap and Hightower slid out into the flat. It is most likely Wilson should have been in the deep middle of the field, and probably the deepest man on the field. Instead he bit on Locker's head fake on Washington's double move, which left Arrington with no help to his inside. If Washington had run a post instead of a go that would have been a touchdown.