The only possible mistake I see is going all in on the turn when there was 3 to a flush on the board. Especially in PO freerolls, very few of the players are looking at pot odds. Giving the villain incorrect pot odds where they will be ignored is a move that I think will benefit you more in a cash game then it will in a tournament. Most of the time I've been knocked out of the PO freerolls, it's been situations like this where I started with the best hand, keep betting, and eventually the other guy catches up and sucks out on me.

I would have played everything up to the turn the same, but I'm not sure what I would have done. There are more factors I would have had to look at such as how weak would I be left if I were to fold the hand and what kind of notes I had taken on the other guy.

Just to clarify, I definitely don't think you played the hand wrong, I'm just trying to give you another perspective.