Sometimes a planned, but unfinished scene gets added in either the beta or the final update. Rarely is it tacked on at the end and allows for more gameplay from a save file that is saved at the end of Alpha's content. It's genuinely best to not make a save of anything until at least the final, though I would recommend usually keeping your saves about one update behind the latest. EK will, and has multiple times, gone back and changed dialogue, character interactions, or occasionally whole choices.