Have they been doing that a lot lately? The show used to be pretty good at keeping with the continuity.Remember twelve years ago when we supposed to pretend Elmo wasn't the ringbearer at Maria and Luis's wedding because Grover took him back in time to show him what SST was like "before he was born," including Maria and Luis's wedding?
Well, now we have to pretend that "D.W.'s Perfect Wish" never happened, because not only is D.W. going to be having her fifth birthday again, but they're making a movie out of it.