Villa boss Martin O'Neill thought his Premiership side should have progressed: "We had the chances to win the game!"
He boss told AVTV Online: "It's a desperate disappointment and hard to take because I felt we should have won.
"We had a number of chances in the game, particularly in the first half, but we spurned them.
"You do worry that they might come back to haunt you - but I always felt we were in control of the match.
"While there were moments in the game where QPR looked a fine, talented and entertaining side, the fact is we had enough chances to get through.
"But it doesn't matter how well you play between the penalty boxes, you have to score when you have the opportunity and defend when you have to.
"I have to say there weren't that many times when we had to defend. I remember Craig Gardner getting a block in the first half and a couple of 35-yarders that didn't really trouble us.
"I feel if we had scored one of our chances in the first half, we would have gone on to win the game. We are really disappointed."