[brian64]

It depends on how the table plays, but you might have had the correct odds to call on the flop strictly for the backdoor low draw. I don't think it's a terrible play given that so many people saw the flop, and it's possible one of your other draws (a 2, backdoor flush, backdoor straight) is good.

Even with the big pot odds, calling 2 bets on the river seems unwise unless you have good reads on the villains. In my experience, even at micro limits it's unusual for someone to raise on the river with a non-nut flush on a paired board.