I liked how this episode called back to her birthday one. On part it was overt, which she mentions her birthday, but also how she's worried about being friends with EVERYpony and becomes very upset when somepony refuses.
The fact that she asks Twlight about it is interesting too. I'd imagine that Twilight has very different views on friendship, as she's every really had friends, (insofar as the show reveals,) till the show starts. Even now, I'd imagine she has acquaintances. Such as she was chatting with Cheerlie. Librarians and teachers often consult one another, so that's probably a professional relationship. I'd imagine she gets long with all the apples and Sweetiebell, family of friends.
SO, Pinkie asking Twilight would give a very different perspective, even if Pinkie as always immediately ignores said advice.