Finally had a chance to review that penalty. Didn't look like a dive, but whether that was a penalty was debatable. They were just both vying for the ball. Ref must have thought Pimpong was being forced down, which is a free kick, and it did look like that from some angle - but didn't from others.
So I dunno... it could have been either way - Ref saw a free kick and, well, a free kick in the box is a penalty. No card was given, so he obviously didn't think it was particularly serious. But anything that can give a free kick can also give a penalty if it's in the box, so it didn't really have to be. I'm sure it will be reviewed to no end.
Oh, and world rankings mean exactly nothing for close teams. Can give a general idea of good, average or bad, but that's it, once you get below a difference of +/- 10 places it's entirely arbitrary.