Although I'm never fond of unexplained deus ex machina type shit (a cloning machine pinkie's always known about but others don't? a book in a hidden compartment in Twi's library that just happens to have the spell to send the pinkies back?), the rest of the episode was funny and rather well put together. It showcased all of the mane 6 without overbearingly focusing on Pinkie like her episodes usually do. We also got to see a chastised, actually tolerable Pinkie with thoughts and feelings beyond surface stuff.
The jokes, of course, were pretty funny as well - the orange/frog still has me laughing.