It's dawned on me that one of the biggest themes of this fic may be the importance of being able to notice flaws in one's models of other people. Virtually every time something has gone wrong in one of Voldemort's plans, it is because he is weak in this area:

• Failure to predict how Harry would react to seeing him (as Quirrell) trying to kill an Aurour in Azkaban
• Failure to predict that Hermione would be suspicious of Mr. Incredibly Suspicious Person
• Failure to see how far Harry would go to keep Hermione out of Azkaban
• Failure to talk Hermione into leaving Hogwarts of her own free will
• The initial failure to predict that people would not treat him very well in his hero role

Then there's Lucius, seeing everything in terms of self-interested plots, and concluding Harry is Voldemort because of it.

And finally, the bit in chapter 81 about how Harry is wiser than either Dumbledore or Voldemort, because he realizes he's able to realize when he doesn't understand people.