I figured out the muddy Rarity 'twist' because it wouldn't make sense for them to show the sequence otherwise, rather than eye colour. I never notice eyes, aren't I so cool and hipster
However, the last episode bugged me far more than it should've. Maybe Rainbow's arrogance combined with popularity produced too much of an emotional response in me, or the moral's poor delivery, or the predictable twist was too silly (the others coming up with an elaborate plan that could potentially damage Dash's self esteem before actually talking to her about their concerns. What?), or something. I think too hard about a kid's show. It just generally could've been done better.
Also, Quara, source? The artist seems quite good, despite my usual avoidance of fanart.