We got away with some PI as well, it's the way they were calling the game both ways, which I'm not a fan of but it is what it is.
On this play I didn't expect a flag, because the defensive contact really wasn't that bad (compared to other things not called in the game) but was made to look bad because of how hard the WR came back for the ball. In the context of how this game was called that was a pretty clean play by both sides.