I hope that they will eventually make episodes regarding Celestia and Luna's past encounters with the antagonists... (and possibly create more questions and confusion)
1. A Time of Reform
Even though this comic is not a reference to the movie "The Dictator" I can't help but to imagine Celestia acting like Aladeen.
2. Coolio
A few days ago, I believe we had a discussion about what King Sombra's motive (or lack of it) was. Well, here's your answer.
3. Equestria's Waiting Room
The magic number is always 1000 when it comes to disappearing... Coincidence? I THINK NOT!