The more I watch the replays the more bizarre the 2nd goal appears. McCarthy seems to track the path of the ball well enough but then decides not to stick out an arm to try and save it and instead ushers the ball into the net.
Regardless of it being shown on screen or not, they've either reduced the time it usually takes them to work it out by about 400% or they didn't forensically review it
I've seen refs play advantage before for fouls outside the box and then pull things back for the freekick when the advantage didn't play out. Don't see why that can't also happen for penalties