the 1 difference I have an issue with is the shape of the tattoo differences, at least make it more visible in the image, so I don't have to shove my face in the screen.
the game is not malware, but it can be marked as a false positive, make sure to add it to your exclusion list in Microsoft security center and the game should run fine.
It's nightmare mode, it's supposed to be hard, if you're looking for the normal experience play the original mode, but I agree with you on the clown, his RNG is bullshit.
About number 1, a lot of neighbors can say they should be on today's list when they aren't and still end up to be neighbors, it depends if everything else checks out, I haven't yet found any case of them not being on the list being the determining factor of a doppelganger, it only raises suspicion.