Hand to heart I can't think of many Letang mistaks in the neutral zone. Bad decisions in his own zone, yes. Go for a risk in their own zone and get caught with his pants down, yes. The neutral zone, not so much. Much as I love his game right now, Malkin seems the most likely to overplay his hand there.
Incidentally, I had a look at NST for a sense of match-up history, and I'm now expecting Julien to try and get Danault out there vs both Crosby and Malkin, with Suzuki getting plenty of both too, and Sullivan being very happy to play along. Don't think he's going to try and play the match-ups too much.