"No! It absolutely cannot be, but my couture sizing sense is never off!"
The Pinkie Pie issue naturally has a few laughs, but possibly the best line in it comes from Twilight. When Pinkie is doing her song and dance number to cheer up Ponyacci, he turns to Twilight (who's playing piano) to ask if she's trying to convince him not to retire as well.
Twilight Sparkle: No, I'm just providing props and background music.
Applejack nodding off as she lies in wait for the Sass Squash:
Applejack: Apple cobbler. Apple burrito. Apple... apple.
Applejack's attempt to get into the mind of Sass Squash:
Applejack: "Gorg! I love the woods!" "Hurk! Bein' elusive is the life for me!" "Bork! Moss is comfortable and delicious!" Now I'm gettin' it! (AJ notices the rest of her family staring at her)
Applebloom brainstorms different ways to catch the Sass Squash:
Applebloom: Oh, oh, we could put on a play! That it would want to come and watch? Or, or...I could play my fiddle! "Music soothes the savage beast!" Maybe if we could coat the ground with gumballs it would trip on them? We could train Winona to sniff it out! Magnets! How do they work?!
The montage of Spike giving the Sea Beasts a crash course in history, math, and other subjects.
When Luna is getting bored of the guards' stories, we're treated to a dramatic page of a sinister-looking cloaked figure going into a condemned part of the city... it turns out its just Celestia sneaking into a hidden fancy spa to enjoy her day off.
The face Luna makes as she goes "WHAT."
Luna shutting Kibitz up by way of stuffing a bunch of papers down his throat when she's had enough. The way his mustache flies up, especially!