Simple.
1) Yet again Jones has not found a half decent left back, he went for Lee Naylor and Jlloyd Samuel, we all know what Naylor's like and Samuel, although a decent footballer is obviously lacking in match fitness as shown today, not having a half decent left back cost us massiely, many deccent/good left backs and full backs in the premiership we could have loaned/bought, Norwich have one, and so do QPR.
2) We don't have that creative spark in midfield which has been obvious all season. Notice the difference when we had Ramsey, obviously Rambo is a quality player and you can't expect to find another anything like him, but we needed someone in the mould of Taarabt/Hoolahan/Surman. Oli isn't creative enough. McPhail has lost his pace, the tempo of his game isn't quick enough to match Bellamy's pace. It's evident that Whitts also isn't up to the pace of playing at Central attacking midfield, and is much better suited at Left midfield where he has been getting a few goals recently.
Filling in these gaps certainly would have got us the points today, and I;m sure many more. I would have loved to see us sign determined passionate players as well.