flop AAA

[superfast]

Live game, 2-5 NL. I have about 500. I raise 25 in early position PF with AA, 2nd or third from BB. 4 callers. flop is A,9,7 no flush draw. I bet 50, first guy to my left calls, others fold behind. Turn comes with a card to the straight I think a 6, but his call would have to have been with a gut shot on the flop. I bet 75, he raises 75, I go all in for what he has left, about 300. He shows 5 8 and wins. Comment on my errors please.