Schumacher's botched pit stop takes the award for me - the chief mechanics haste in sending Schumacher out cost them dearly, as I suspect that Schumacher might well have been able to get his car onto the podium as well. It could well have been a 1-2 for Mercedes in the circumstances, which would have put them into 3rd in the WCC - the team might come to rue those lost points at the end of the season...
Enforcer, though, makes a good point about Sauber - we were all talking about Kobayashi's chances, only for him to fall back to 10th place and play a minor role in the evolution of the race, whilst Perez also lost ground and ended up failing to score any points at all. Neither driver could really get their strategies to work, even though Sauber tried covering its rivals by stopping Kamui three times and Perez twice - before the squabbling between Perez and Kobayashi very nearly cost Sauber the one point it got for 10th.
As for Kimi, it looks like the team were trying to be a bit too clever for its own good by switching Kimi from what looked like a planned three stop to a two stop strategy. That said, whilst it may have been asking a lot for Kimi to manage his tyres for 28 laps, Grosjean managed to keep his tyres together for 24 laps and still kept pumping in 1m41's right up to, and including, the very last lap, so you have to wonder whether Kimi's driving style played its part (the commentators did note that he was spinning his rear tyres in the slower corners, and the current tyres do tend to overheat and break down more rapidly if you spin them up too much).
Martin Brundle, on watching a replay of Grosjean spinning:
"The problem with Grosjean is that he want to take a look back at the corner he's just exited"