Setting aside the fact that the play action worked last week because of the great play calling mix and successful run game, I saw two things when Allen ran play action that really set it apart. Watch the TD play to Tommy Doyle and you'll see both of these:
1) Unlike many QBs running the play action, Allen did not hold the ball out to the RBs with both hands. He held it out with his left hand only, keeping his right hand free. When he began to curl around to his right after faking the handoff the ball was completely blocked by his body, and his empty throwing hand sent a signal to the D that the ball had been handed off.
2) Allen took the ball very deep (a 9 yard drop at the apex of his curl-around) and very fast into the backfield, leaving him a ton of time before any Defensive spies would have a chance to reach and pressure him. This left all options open to him -- passing if his target was open, looking for a secondary target, running himself or throwing the ball away. On the Doyle TD, the nearest defenders were 6 yards away from him when he threw the ball.
If the Bills can sell the run this weekend, I believe Allen's technique on the play action will open up some big plays for the Bills. Thoughts?