There are reasonable match reports at http://arsenalcolumn.co.uk/?p=7515
A brief word on the substitutions, in particular the introduction of RvP. AW seems to believe that he can play in the middle of the 3 in a 4-2-3-1. In this match, in this role, he offered nothing. It is all the more puzzling as AA remained wide on the left when his most influential half this season was in the second period at Villa when he played just behind the main striker. To me, it would have been better to move AA centrally and to play RvP wide, say inside-out on the right where he could cut-in on his left, stronger, foot.