Look at the bottom of the nose, where on the character in the window the nose is connected as a "u" shape, on the list the nose goes down and isn't connected like a "\ /" shape.
Also, if you let someone in, and then they come along again, as far as I know it's always an imposter because you wouldn't need to let the same person in twice!
Ah yes, you are correct, thank you for the reply. Honestly, details that small are very difficult to see because the pictures on the list and in the folder are much smaller than the person standing behind the window, causing a lot of the finer details to become muddled together, kind of like a picture losing details and quality when the resolution is reduced, so I'm not a fan of details that are so small that reducing the picture size is all it takes to miss it. Even with you pointing this out, I still didn't see it until I zoomed all the way in. I was even playing this with another person at the time, and neither of us could see it.
Of course I knew that she was fake since I'd already let the real one in, but the fake one always has a discrepancy of some kind. From my experience, the real one already being in isn't enough; I've yet to see a 'Perfect Copy' of a character. There's always a flaw somewhere if they're not real. Sometimes I let them in on purpose so I can let the result screen tell me what was wrong and learn that way if I couldn't see it myself. Thank you for the reply, this was really bothering me, and you saw what I couldn't see. Thank you!