There are some thematic similarities to the episode Forever Filly, but more basically this was a total unicorn episode. Maud was the only non-unicorn, but she fit in just fine because of the theme.
The issue I see portrayed here that the episode sadly didn't even quite touch on due to it being like a unicorn mind bubble is that friendship based on common interests alone, not on interest in each other, is a relatively weak friendship. It's a wholly different level to base it on deeper bonds than just shared interests. New discoveries and all matters of the mind might delight the heart, but when they are gone, so is the delight. And usually just being together a lot in childhood creates a strong bond by itself, but here we saw an example where that, too, was just based on shared interests. (I have a deliberately puzzling saying to sum this up: "True friendship is nothing personal.")
Thus, Starlight was closed to just sharing joy with her friend, to generate/practice friendship instead of just expecting to reap the fruits. Her openness is very conditional; her friendship is not practiced in appreciation of itself. Once again I am reminded how Fluttershy should be the actual princess of friendship. She is very heart-focused, and that's where the source of potentially infinite strength lies. In fact, because of how she helped Discord, she should be the Princess Of Mighty Friendship (POMF). And since Pinkie Pie's element is laughter, she should be the Princess of Neighs (PoNeigh). But I digress.
This episode could maybe also be considered somewhat autism-themed, since these things seem typical troubles that autistic people face in their life. This would at least explain why the resolution was very modest and still based on the characters' traits that caused the trouble in the first place. A doing-what-works kind of approach that also preserves their character archetypes.
When Starlight commented on how the warehouse looked smaller on the outside, that was an amusing self-joke. Who didn't think exactly that? "Where the hay is that huge warehouse in Ponyville? Never seen it before."
Judging by the bed scene, Sunburst seems to have gotten too used to wearing his robe. Or maybe the reason he is wearing it all the time is because he's got some kind of insecurity. Starlight seems to know, since she's not inquiring about it. This is the same kind of oddity as with Fluttershy in an early episode. It's generally a bit of a downer to me if the writers ignore the characters' pony nature and just make them act like pony-shaped humans.
I found the brief Maud comedy dialogue very witty. Selfless humor, all in the perception, not in the performer. But then she kinda blew it and revealed she's just got a Cmdr. Data approach to it. From the show audience perspective it still worked though. She was funny when she claimed she wasn't and then wasn't funny when she claimed she was.