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.
YMMV: A Brief History of Equestria
Abduction Is Love: Seven years after the Warming, Hurricane steals Clover out of her own bedroom. However, he's a complete gentlepony about it, and eventually returns Clover to her bedroom after sharing a private dinner with her. It's suspected that Princess Platinum helped set this up without either Hurricane's or Clover's knowledge.
Bizarro Episode: The original version of chapter 18 — covering the formation of a unified Equestrian government after the Winter War, it suddenly runs into a tangent about how awesome Puddinghead's parties were, then describes a scene where Hurricane and Slendermare fought over who's sexiest, and then there was an orgy... and then Twilight Sparkle wakes up at her desk, where she fell asleep working on the text. This was an April Fool's Day joke chapter, and it was later moved to Brief History: Side Stories and replaced with a proper chapter.
Complete Monster: Talonhoof; launching a full extermination war against Equestria (and taking great joy in killing a child) are just a few of his deeds.
Tear Jerker: Princess Platinum's final moments, wherein she convinces herself both that her father and Star-Swirl would be disappointed in her and that she'd be facing eternal damnation for the Necessarily Evil acts she performed for the greater good. Also, Velvet Hooves' and Clover's emotional breakdowns in reaction to her death.
There's also Platinum admitting to herself that the reason she's never let herself return Velvet Hooves' love for her is the fact that, with her Special Talent being literally a Manipulative Bitch, she can never be sure that she didn't subconsciously make him love her.
At one point a letter from Smart Cookie mentions that of her seven children, only four of them survived to adulthood.