How many mistakes did I make?

.25/.50 limit

I'm UTG, with QKo.

I raised preflop, got 2 callers, sb completes, bb completes.

Flop comes: 5d, 9h, 2h. sb & bb check, I check button bets, sb raises, we all call.

Here with the check raise, I think I should've folded.

Turn comes- Qs
sb bets, I raise, 2 call, sb reraises, I call, 2 call.

River- Ks.

sb bets, I raise, 1 fold, 1 call, sb 3 bets, I cap it, 1 call, sb calls.

Final pot, 35xbb.

I'd be surprised if the SB doesn't have trips! Once he re-raised the Q raise on the turn I suspect he has to have trips or 2 pair but after your raise is re-raised again on the river It looks pretty convincing he has 3 of a kind.

Excellent read. It had been a fairly aggressive table, with 3 bets just for middle pair, top kicker. I decided to push. Lost a crapload with that hand. I'm too accustomed to playing passive players, aggression throws off all my reads.