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: MLP: Friendship Is Magic S2 E1 "The Return of Harmony Part 1"
If one takes Discord's hint how to find Elements of Harmony from other perspective (ie. you as viewers), you will find 0:00 of first episode, which happens to be cover of guide to Elements of Harmony. Where Twilight finds Elements of Harmony? In the guide to them.
Fluttershy says she's weak and helpless. This makes sense when you realize that alone she is weak and helpless; see how she reacted to Gilda's bullying when on her own. Fluttershy's strength comes from her friends.
Discord in general once he shows his true colors. He's just so gleefulmind raping the six.
Listen closely when Celestia talks about Discord's reign of terror. Really closely. There's screaming. Agonized screaming.
Everything Discord does in the hedge maze.
Love to Hate: Discord. Mostly because he is the first truly evil villain of the series.
Magnificent Bastard: Discord. Outwits everyone with the greatest of ease, all the while relishing in his evil and having a blast.
Mis-blamed: Because of their arguing over what the statue of Discord meant, the Cutie Mark Crusaders are often blamed for Discord's return. Even when it's later said by Celestia that it's because she no longer tied to the Elements of Harmony.
Narm Charm: Discord's last line of the episode is delivered while he's holding an inside out pink umbrella. Normally, that'd make a scene less menacing, but considering his character and the delivery of the line, you probably won't be too distracted by it.
This umbrella also meows when he opens it.
This fits with the fact that when Discord claps, each clap is a different sound effect.
It may fit his personality well, but it can be hard to take Discord seriously, even in his worst moments, because of his appearance, which includes half a set of buck teeth and a pink tail, amongst many other things.
The talking apples. It must be the bobbing.
Paranoia Fuel: Discord knows way too much about the Mane Cast despite being imprisoned in stone for over 1000 years...
They Wasted a Perfectly Good Plot: Fluttershy beats Discord's games...This goes nowhere. Despite being able to defy what he tried to use against her being a recurring theme with her, this is never mentioned again, despite her playing a big role in the second part and later being tasked with reforming Discord. It feels like there could have been a lot more done with it.
Visual Effects of Awesome: Lauren Faust has apparently said a few of the scenes were thought impossible to do in Flash. The stained glass scene stands out as a likely example.
The zoom-in on Canterlot is also pretty nice. Seems they're getting a lot better at Flash this season!