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Comfy Scenes
A whole, whole lot of comfy scenes in this episode. I like the Golden Oaks Library, so Twilight Sparkle waking up, or studying at night there, is automatically comfy. Though the highlight of comfy scenes is probably the meteor shower. Probably the most screen caps and references to this episode I've seen is actually this. I think it's because it provides a lot of group shots of the mane six with some family and leads itself for use in PMVs and what not. 

Spike in Sugercube Corner or...'
This is me probably overthinking something, but bare with me...
Spike is has 4 scenes looking for a quill for Twilight before leaving Golden Oaks Library to look around Ponyville for a quill. One of these scenes though appears to be in Sugercube Corner. Yet, it is clearly established afterwards of him leaving with Twilight Sparkle trying to tell him to wait after this scene and Spike went to Sugercube Corner later and tried to ask Pinkie Pie for some quills. Was the scene in Sugercube Corner out of sequence or did they just reuse Sugercube Corner for a kitchen scene possibly intended to take place in Golden Oak's Library?  

Rainbow Dash Recognizing Spike's Jealousy.
A small moment, but, considering how Rainbow Dash can be a bit dense and insensitive (remember Pinkie Pie being the one telling her not to prank Fluttershy? Her lifelong friend?) so I am surprised at Rainbow Dash being the one to notice that in Spike here. Show a slight perceptive side. Maybe she knows jealousy all too well? 

Comets
Twilight's scientific description of comets is only interesting in the context of magical horses with stars seemingly under Luna's command. Some celestial objects are natural and what we expect them to be (or close).   

Green Dragon
I wonder if this Green Dragon has any names or fics about him? He certainly seems like a forgotten character. Maybe I can do something? lol!

Spike. Sure, I was disappointed, but you are my number one assistant! And friend. And you always will be
I consider this line in the context of Twilight having a familial relation to Spike, this doesn't disprove it, clearly Spike is close to Twilight like family, but where fandom and show sometimes went later, I consider this phrasing interesting. Again, IIRC, Faust said Celestia was a mother figure to Spike. 

Animation
...seemed slightly choppier in some of the action scenes, might just be my tired eyes. Don't have time to rewatch it intently right now. 

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> Who
Or should I say, "Hoo!" I guess it would be better phrased as a hoo joke.