Answers after the break.
1) Am I still pretty?
2) There’s all kinds of racial slurs, mostly from before the founding of Equestria, but there are modern day ones as well.
I don’t believe there are any that ponies regularly call themselves, though. So no analog I can think of.
3) Twilight also possesses a great magical potential and is fairly well-versed in spell casting. Most of my magical knowledge is just in theoretical or broad aspects. I can only even read basic or very specific spells.
4) I was tickled pink that I actually manage to find this clip.
5) Apples. Apples. Apples!
6) Sounds more like a youth group, not that I’m trying to knock it.
Might want to make sure you get permission on some of those things, though.