yeah Dash was set up for this bi thing "save her home or doom the world, assuming that wasn't a trick" and even what we saw had promise "she thinks that cloud is ALL of Cloudsdale?"
But we really don't get much from it.
it was like "hey look we got 1 more minutes need to cure everypony!"
I thought the memory spell was a bit rushed but the Discord final face down was the right speed, honestly it should have been a 3 parter with the last half of 2 and first half of 3 really showing Twilight curing the mane 5, and giving us a flash back on Dash's delusion, ending with the big Discord fight