144 deviants said Equestria has some of the most powerful beings in the pony universe on their side (Princesses) yet Twilight was afraid of some primitve cows from a distant land. Maybe yaks were aware of princesses' uselesness?
79 deviants said So Twilight said Yakyakistan is so far to the north that nopony's even been there, but you can apparently go back and forth in the matter of one afternoon. I think that all that travelling was just Pinkie having 'a trip'.
75 deviants said Ok, so Pinkie was travelling north to the Crystal Empire, but ended up in Dodge City that is, according to the CANON map of Equestria, south of Ponyville, yet the conductor said 'next stop, Crystal Empire'. Is it a retcon?
65 deviants said Now I hope Twilight can understand why Celestia just wanted her to wave at the crowds and just look nice rather than take care of diplomatic stuff (re. S4E26). Leave Twilight alone for a while and you have a war about to erupt.
64 deviants said "Foreginers (Yaks) can't speak proper English because they are too stupid" cliche.
64 deviants said If no pony ever returned from Yakyakistan, how did they invite yaks to Ponyville? By a bird? Or maybe a yak just casually visited the Crystal Empire that was gone for a thousand years and Twi just invited them over? Far-fetched!
33 deviants said The way ponies tried to clean up after the prince's rage was ridiculous: Fluttershy was putting a torn rug on a wall, and Applejack was hammering nails into a broken wooden rail that should be replaced...
19 deviants said At first I wanted to say that the running joke about Spike getting hit with a door is a sin, but the way he stood at the door was just him asking for being hit. I can't believe he doesn't suffer from a door-related PTSD yet.
16 deviants said How could the sheep stop the trains? Couldn't they just push the sheep off the tracks? Oh, wait. It was during Pinkie's "trip". Still a sin.
10 deviants said By delivering the letter, Gummy was actually useful for once. Which is a sin, because that's OOC.