QPR manager Mark Warburton was frustrated that his side were denied what seemed like a clear penalty against Derby.
Colin Kazim-Richards scored the only goal of the game and had a lucky escape when he got away with handling Ilias Chair’s corner.
Rangers’ players were incensed by the decision not to award a spot-kick.
Warburton said: “I don’t think we did enough to win the game but I don’t think we deserved to lose it.
“That was the most blatant handball you’re going to see. The players’ reaction tells you that’s an obvious handball. I’m not sure how that’s been missed.
“When you’re having a bad day and not at your best - and we were below our best for much of the game - you need those calls to go right.
“But we didn’t do enough in the first half especially. We gave the ball away cheaply and were not on the front foot.
“When you’re having a bad day, you need to do the basics well. We didn’t do that.
“We lost silly duels and gave the ball away loosely. We gave away a sloppy goal and gave them something to hang onto.
“Then, for all our possession and all the balls into the box, we lacked that bit of quality to get something out of what was a poor game of football.”
Warburton also confirmed that Rangers are "very close" to making another signing.
A deal has been agreed for midfielder Stefan Johansen to join on loan from Fulham.
Wayne Rooney said a half-time tactical change made all the difference.
Kazim-Richards’ second-half goal on the counter-attack gave the Rams a second successive victory.
It came after Rooney, in his third match since being made Derby manager on a permanent basis, made a substitution at the interval, replacing defender George Evans with midfielder Max Bird.
Rooney explained: “We started very well and then let the game slip and lost a bit of control.
“We made a tactical change and it was about determination not to concede as we knew we’d have chances on the break. Fortunately we scored with one of those chances.
“George Evans coming off was not because of his performance but to get another midfielder in there to get control of the game.
“I’ve always been someone who can read the game. And it’s not just me - it’s the coaches and we’re talking constantly about whether we need to make a change or not.
“There will be games when I have to hold my hands up and admit I got it wrong.