These are what we call the 'YMMV items.' Things that some people find in this work. We call them 'your mileage might vary' because not everyone sees these things in the same way. This starts discussions in the trope lists, a thing we don't want. Please use the discussion page if you'd like to discuss any of these items.
Ensemble Darkhorse: While actually a minor character, Dolokhov seems to fit an unusual number of tropes, and makes enough of an impact on main characters' lives to merit distinction.
Hollywood Homely: Princess Marya howers somewhat close to this. From the very beginning she is depicted as butt-ugly, but then, during her romance with Nikolai Rostov she becomes quite attractive. Go figure.
She was never depicted as ugly, but rather just plain. A sort of "diamond in the rough"
Are we talking about the Russian original or some English translation? As a matter of fact, Tolstoy does mention her "ugly, unhealthy face" and "ugly, weak body" ("некрасивое, болезненное лицо", "некрасивое, слабое тело") very early in the novel. The first impression is so strong that the Russian high school students either tend to overlook her abovementioned metamorphose after the encounter with Nikolai Rostov (her plot line is a secondary one, after all), or it comes to them as a shock.
Historical Badass Upgrade: Inverted with Napoleon; Tolstoy took pains to discredit him, most likely to the point of making him appear less competent than he really was.
Historical Villain Upgrade: Napoleon Bonaparte, most certainly. While Tolstoy did do a lot of the research, he apparently had no problem skewing things to make Napoleon look as bad as possible. To give one example, the story of the Polish cavalry charging into a river at his command and nearly drowning themselves was based on a true story, though YMMV on how far he went. But while in the book Napoleon takes this moment to relish in his power over life and death, the reality was that he took a while to realize they were actually drowning, and when he did he immediately jumped in to help rescue them.
Ho Yay: It gets hilarious (and slightly worrying) whenever Rostov sees the tsar.
Hype Backlash: You want some hype? This book is considered one of the greatest novels ever written, a masterpiece of world literature. It's been considered that for over a century now.
Inferred Holocaust: While arguing with Pierre, a character who disagrees with him acknowledges that he does have a point, referencing the story of Napoleon's giving aid to the plague-stricken. To those who know what happened in Real Life, however, this line is considerably more ironic and chilling...