Every one of them should have been called back for offside.
Given Suarez's imminent suspension, that probably locks up the Golden Boot for RVP as well.
And this is much ado about nothing as the EPL has been academic for a month.
Sure seems offsides on goals 2 and 3 though.
Despite the three goals, two of them were questionable based on whether the referee should have blown his whistle for offside. The third goal, especially, looked like it was marginally offside.
I can give the linesman a pass on missing the offside call on the second goal (the volley). It was very tight. Van Persie was on the run and just about half of his foot was in an offside position. It wasn't even obvious on first glance when they froze the frame on the replay.