Well if you see highlights, Torres gets taken out at the edge of the box but inside, but the ref wasn't in best position but this one, like I said Lampard went down easy but he was still tripped and it was inside. Kalou goes down a couple of times but those were clear dives.
Have to add: fair play to Stoke though, they've got a good idea by getting some great crossers and Delap's throws. Pretty organised at the back as well.