90% of the movie was great except when they tried to explain that they are clones. If it was mystical like a mirror universe then it fits perfectly. But you can't simply clone a t-shirt unless they also have a replicator down in the basement that can magically create them. If they replaced this scene instead or rewrite this part : the protagonist got lost on the mirror house but set loose a doppelgänger from the mirror verse who then claimed her identity in the real world. She (the real one) was so bent in getting back that she opened their world to the real world. This would have make the movie more logical. Paranormal better answer than clones.