>>4379
>Twilight Sparkle and her friends have already overseen summits and events larger than this plenty of times before. Her worries over the sun and moon are perfectly understandable though. This is more of an observation than any kind of negative remark.
yeah. The only justifiable answer that I can give to your question is that the writers wanted to make a little bit fun of her while trying to solve how it works. In fact, all the tasks were accomplished except that one because of her obsession, giving one more spin to it that it should.

>Luna has never used the post office? That seems pretty basic thing to miss out on. Then again, the royal sisters use scrolls, so I guess it could work.
what is ordinary for some, it´s exotic and unusual for others. They have been so accommodated to getting the letters with magic that sending them via post officer is just a fresh thing for them, especially for Luna. However, the message goes beyond that because we can see how Luna gets really excited about it. It´s so ridiculous that she values the process of sending the letter than the objective or content that appears in it.

I could even go a little bit far with this little scene and maybe the writers have used this (really subtle) as a weapon to criticize the instant actions with the technology while we are not appreciating the work behind it. However, I highly doubt it because this episode was aimed to a chill out mentality this time.

>>4380
>Only complaint that I saw that I could even partly agree with was the faces that were used a few times looked off. I think the princesses less circular heads make some of these faces less appealing than on the average pony (well, mare anyway). It was too small to factor into my rating however, and it certainly wasn't a prominent as some made it out to be. Mainly with Celestia.
those faces only appeared for a couple of minutes in the first third. After they leave Canterlot, I don´t recall seeing them. That´s a valid complain and you are not the only one who has pointed out this detail. Several users of /mlp/ had mixed reactions towards this but that criticism is palpable enough to understand those concerns, unlike mindless episodes of drama.

>>4381
>And the song was pretty good too. Though I was pretty distracted by all the random ponies/others out on this on grassy trail just doing random stuff.
those bits of the song represent all the world that we know and the places that they can visit freely with this opportunity. See how it compiles all the species (dragons, changelings, hippogriffs...) and locations of potential interest, especially in the part of that gif which you have posted here. It´s distracting but it serves its purpose to show how much they have been missing by staying in their thrones most of the time, without getting any sort of fresh air on their lives.