As Meghan McCarthy revealed over on her Twitter page, it looks like Keep Calm and Flutter On didn't originally have it's current (and completely awesome) title. The original was changed somewhere during production.
What does this mean for all of you that have checked out the synopsis? It's pun time! Give the episode an alternate title in the comments, filled with puns.
We can expect to see the actual old title some time after the episode airs.
Thanks to Anthony for the heads up!