City manager Dave Jones' main gripe after the 2 - 1 defeat at Loftus Rd was the non award of a penalty after Jay Bothroyd was fouled in the box.
"How can the referee not see it? And if he doesn't see it, how can the linesman not see it?" asked Jones.
"They're the big decisions that matter in tight games like this.
"Everybody in the stadium could see it was a penalty. The reaction of the QPR players tells you that. We feel hard done by.
"I went to see him (the referee) about it afterwards and he asked if I was questioning his integrity. I was questioning his decision.
"Referees have got to be better in games like this. Was the game too big for him? That's for the referee's assessor to decide."
But QPR boss Neil Warnock had a different view.
"I thought the referee had a good game," he said. "What Dave's saying is deflecting from the result, and we deserved to win that match."
Jones disagreed believing a draw would have been the fairest result.
He added: "It was an even game and both teams deserved to get something from it.
"We probably should have, as we had a lot of chances in the second half.
"The decisions were the difference between us getting a point and not.
"It's a kick in the teeth but we were behind QPR and caught up with them before, and we'll have to do it again."