The Brother (Spoilers)
I understand it was supposed to be a "twist" when we find out that the brother doctored half the images of Alice.
But was that really necessary? It completely took me out of the film, and even though there really was the ghost of Alice in various shots, it was more of a "The Boy Who Cried Wolf" scenario for me. Which images are real, which one's aren't, etc.
I think the movie would have been a lot creepier if that whole plot twist was just left out.
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I don't put movie quotes in my signature.