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 E14 "Suited for Success"
Fridge Brilliance: Many have noted that Rainbow Dash's "bad" dress doesn't look anywhere near as bad as the others and is actually pretty cool, if inappropriate for the occasion. This is because despite her insisting to make things cooler, she had the least actual creative involvement and so Rarity managed to make something that was at least tolerable out of her demands.
The lyrics that Rainbow Dash "won't look like a tank" and Fluttershy's dress should be "something breezy." M. A. Larson picked up on this as well and went full Trolling Creator with it, cracking that the lyrics for the song are deliberately meant to foreshadow more future episodes.