For Arsène Wenger something is not quite adding up. Petr Cech enjoyed the quietest of afternoons in Arsenal’s goal yet Steve McClaren and his Newcastle United players were greeted by enthusiastic applause as they strode back onto the pitch and saluted their fans at the end.The abuse was reserved for referee Andre Marriner and served as a reminder that this was a contest shaped by Alexsandar Mitrovic’s early dismissal.