Failed a Spot Check: Pinkie Pie, who knows all details about all her friends, doesn't recognize Rarity's double is not her.
Pinkie: "Ooh! A wall!."
Gold Digger: Diamond Tiara's mother apparently only married Filthy Rich for his money
Hidden Depths: Blueblood is shaping up to be this. He's shown to take his royal duties seriously, was capable of stopping a drunken Rarity when she attacked him without either of them getting hurt, and has mentioned knowing both Twilight and Spike pretty well in the past.
Jerkass Has a Point: When Rarity asks why Blueblood treated her so horribly at the Gala if he isn't that much of a snob as he appears, he calls her out on pursuing him for his money and status without knowing anything about him, which she privately concedes. However, when she then asks why he didn't just reject her from minute one, he admits that he did it because it was fun.
Flim and Flam get away without any legal repercussions from outing Applejack and Twilight's relationship due to privacy laws.
Lighter and Softer: Compared to The Nuptialverse. This also takes place post-wedding, but rather than beat themselves over their treatment of Twilight, the rest of group mostly just let Twilight get away with almost anything around them for the months that followed.
Mythology Gag: Pinkie entertains Apple Bloom with a story her Granny Pie had taught her, which is clearly based on the first TV special from the G1 series (the one with Tirek and the Rainbow of Light).
Shipper on Deck: Twilight theorizes this may be the motive for the culprit behind the marriage and enchanted rings, albeit a rather mean-spirited shipper in her theory. Also, Pinkie Pie is a big-time shipper.