I think someone brought it up, but I could have sworn that Rainbow Dash's cutie mark was part of her racing and speed, not cloud clearing.
I am watching the episode again, since it is on right now on the Hub, and if I have this right the spell is created to find ones own destiny by fucking up the friends you have so you can fix it and find out what you need to do.
---------- Post added 2013-02-17 at 10:53 AM ----------
So whatever that other dimension is that Twilight got teleported to Celestia knows full well about.
I need these questions answered.