The Rockets players didn't have anything to play for, but D'Antoni wanted to win that game badly. Pop has been a thorn in his side since his Phoenix Suns days, why else play Harden 36 minutes and risk injury in what amounts to a meaningless game for them?
If I was a Rockets fan, I'd be a little mad at D'Antoni for letting Harden play that many minutes in meaningless games. I'd rather try and get him some rest and less exposure to a possible injury. I know a couple Rockets fans that want to know why he's still playing 30+ minutes a night right now.