Ovechkin's +/- in his recent hat trick game

Question

Alex Ovechkin had 3 goals and 1 assist in Saturday's 5-1 win over the New Jersey Devils. The Devils only scored 1 goal so I'd assume his minimum +/-, assuming he was on the ice when the Devils scored, is +3 (4 points for - 1 against). But he is listed as +2. Is this a mistake, me being stupid, or missing something about +/-?

Answer 1

Power play goals don't count towards the scoring team players' +. One of Ovechkin's goals and his assist were both on power play.