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.
Tear Jerker: When Rarity's mother comes home, and gives her some bad news: she's taking a touring gig, and giving up custody of her.
Rarity: You are new to tragedy. But you are pretty sure that of all the worst possible things that could happen, this is the worst. possible. thing.
The time-traveling Mare-Do-Well an alternate Rainbow Dash unintentionally hints that she comes from a Bad Future. Applejack gives her a name and invites her to potentially join the Apple Family as 'Apple Cider'.