Derpy cameo: She is seen at the beginning of the episode snapping a twig off of a tree.
About twenty seconds into the episode, an earth pony is seen picking up a branch using magic on the right-hand side of the screen.
When Applejack bounces Rarity out of the bed, Rarity momentarily has five legs.
Applejack: I'm mighty sorry, Twilight.
Twilight Sparkle: It's. . . well, it's not okay! There's a giant tree branch in the middle of my bedroom, and the book doesn't say anything about having a giant tree branch at your slumber party, or at least I haven't found that entry yet. . .
Applejack: I'd like to tell y'all the terrifying tale of the prissy ghost who drove everypony crazy with her unnecessary neatness! Oowoowoowoowoowoowoo! I'm sure y'all are familiar with that one.
Rarity: Never heard of it, but I have a much better one. It's the horrifying story of the messy, inconsiderate ghost who irritated everypony within a hundred miles! Oowoowoowoo!
Applejack: That's not a real story! You made it up!
Rarity: It is a ghost story. They're all made up.
Twilight Sparkle: Let's see what our next fun, fun, fun thing is, shall we? (checks book) Hmm, what does this mean? "Pillow fight"?
Rarity: Oh, please. I am not at all interested in participating in something so crude... (gets hit in the face by a pillow) Oh! It. Is. On!
Applejack: Whoa, nelly. Is inside a tree really the best place to be in a lightning storm?
Twilight Sparkle: It is if you have a magical lightning rod protecting your home like I do. Come on in!
Rarity: You know, there's "messy", and there's "just plain rude."
Applejack: You know, there's "fussy", and there's "just plain gettin' on mah nerves!"
The title of this episode, "Look Before You Sleep", is a pun on the common phrase, "look before you leap".
Rainbow Dash, Pinkie Pie, and Fluttershy were absent in this episode.
Friendship Report: Rarity and Applejack both learned that they can embrace each others' differences and discover a way to be friends.
This episode revolves around Applejack and Rarity.
Twilight's book, Slumber 101: All You've Ever Wanted to Know About Slumber Parties (But Were Afraid to Ask), is a reference to Everything You Always Wanted to Know About Sex (But Were Afraid to Ask) by David Reuben, M.D.
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