A9 flop top two no draws - did i do something wrong?

[chrisbroholm]

<font class="small">Code:</font><hr /><pre>Game #3608366143: Hold'em NL ($0.15/$0.25) - 2007/03/26 - 20:47:16 (GMT)
Table "Scherzo" Seat 3 is the button.
Seat 1: Zarazekkr ($41.43 in chips)
Seat 2: Bananas ($30.88 in chips)
Seat 3: albinp ($20 in chips)
Seat 4: Mrssplash ($19.95 in chips)
Seat 5: alterego ($38.46 in chips)
Seat 6: TheFish ($31.32 in chips)
Mrssplash: posts small blind $0.15
alterego: posts big blind $0.25
----- HOLE CARDS -----
dealt to alterego [9s Ac]
TheFish: folds
Zarazekkr: calls $0.25
Bananas: calls $0.25
albinp: folds
Mrssplash: calls $0.10
alterego: raises to $1.25
Zarazekkr: calls $1
Bananas: calls $1
Mrssplash: calls $1
----- FLOP ----- [Ad 8s 9h]
Mrssplash: checks
alterego: bets $3
Zarazekkr: raises to $12.50
Bananas: folds
Mrssplash: folds
alterego: raises to $37.21 and is all-in
Zarazekkr: calls $24.71
----- TURN ----- [Ad 8s 9h][Qh]
----- RIVER ----- [Ad 8s 9h Qh][Th]
----- SHOW DOWN -----
alterego: shows [9s Ac] (Two Pairs, Aces and Nines, Queen high)
Zarazekkr: shows [9d 9c] (Three of a kind, Nines, Ace high)
Zarazekkr collected $76.42 from Main pot
----- SUMMARY -----
Total pot $79.42 Main pot $76.42 Rake $3
Board [Ad 8s 9h Qh Th]
Seat 1: Zarazekkr showed [9d 9c] and won ($76.42) with Three of a kind, Nines, Ace high
Seat 2: Bananas folded on the Flop
Seat 3: albinp (button) folded before Flop (didn't bet)
Seat 4: Mrssplash (small blind) folded on the Flop
Seat 5: alterego (big blind) showed [9s Ac] and lost with Two Pairs, Aces and Nines, Queen high
Seat 6: TheFish folded before Flop (didn't bet)
</pre><hr />
I didn't even consider him to have a set, i was very happy with my two pairs...did i make other mistakes along the way?