Because of time constraints, much of the backstory gets cut, leaving many viewers who haven't read the books scratching their heads: Get fast, free shipping with Amazon Prime. With the backstories and elaboration from Pottermore, this has kicked in hard with large portions of the fanbase. In the eighth movie, Harry seems to use this to recognize horcruxes. The Healers would fix him up and Oblivate him from all memory of magic and what happened to him for the last six weeks. The subplot involving treatment of the house elves fits this to a tee. Or leave a comment, we would love to hear what you think.