There's a real reason why Shining Armor is screaming in horror at his destroyed comic book: the cover is a clear homage to Action Comics #1, one of the most valuable comic books of all time with the first appearance of Superman, and presumably the comic book in the show has the same equivalent value in Equestria.
When Pinkie Pie is trying not to lose it as Twilight is slowly coming around to the surprise, She makes the face Roger Rabbit makes in Who Framed Roger Rabbit during the "Shave and a Haircut" scene
First time Featherweight speaks.
Friendship Report: Pinkie learned true friends know how to keep secrets no matter what.