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: The Vinyl Scratch Tapes
Author's Saving Throw: After Season One was written, Lauren Faust made several Word of God statements that Jossed almost everything Vinyl Scratch accused Celestia of in her interview, thereby making Vinyl look like an utter bitch making false accusations about one of the rulers of Equestria. Season Two, Episode Three…has Luna tear Vinyl Scratch apart for making false accusations about one of the rulers of Equestria.
And Season 2 Episode 4 has Luna backpedaling a bit herself.
Fridge Logic: The story casts Princess Luna in a very positive light, but Octavia freely calls Vinyl a lunatic. Considering the root word and original meaning of that word, it should be very taboo in Equestria.
Harsher in Hindsight: "Ponyville Confidential" had many tropers feeling bad when a town was shunning three small fillies for a single day when their insensitivity caused problems. Now imagine pretty much the whole of Equestria openly wanting their deaths and attacking them wherever they go, for months on end. That's Blueblood, except without two additional ponies to share his pain with (at least at first).
Then again, it's difficult to feel bad for someone who's heavily implied to use unpaid children for labor, and would use the body of another pony to put out a fire.
Jerkass Woobie: Blueblood. He does some bad things, but he suffers so much for them, from without and within, that even Vinyl comes to feel sorry for him, which triggers his Heel-Face Turn.
Les Yay: Vinyl openly flirts with Octavia every chapter, and apparently Spitfire was her first kiss.
Season 2 takes it Up to Eleven now that they may be in an actual relationship.
Tear Jerker: The end of season 2, episode 2. Blueblood tries to ask Trixie out, but winds up accidentally offending her, driving her to storm out of the station. A lot of the time, he's a total jerk, but here he's really trying to be nice. When it fails, he goes into such deep sadness and self-loathing that he spends the whole night getting drunk and repeatedly puts himself down over the next few days.