In hindsight it didn't pay off but the only error he made was probably bringing all 3 on so soon, but i've done that a few times on champ manager if i've been frustrated. The intent was to get Chelsea back into the game though, so he should be commended for that, he took a risk and it didn't pay off but that's all really and, after all, they're clear at the top of the league and still in the other cups.
ROFL @ Martin Tyler's reaction when Johnson saved the free kick