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: My Little Pony: Friendship Is Magic S1 E19 "A Dog and Pony Show"
Ass Pull: While it had been established as early as "Boast Busters" that Twilight Sparkle could perform many different spells whereas most unicorns can generally only do one, her ability to use Rarity's gem-finding spell had never been brought up or mentioned until Spike brings it up out of nowhere.
Sapphire Shores was somewhat popular within' the fandom at the time though not as popular as Photo Finish or Hoity Toity.
The Diamond Dogs were this at times.
Fridge Brilliance: Dogs have much better hearing, so of course they found Rarity's whining more annoying.
Harsher in Hindsight: In "Secret of My Excess", Rarity revealed that she had been aware of Spike's crush for a long time. As early as this episode, we can see her exploiting this by flirting with him to get him to dig up jewels for her.