What bothered me about the film. *spoilers*

The cellphone footage in the movie is of terrible quality. Yet the family is able to tell exactly what is going on.

* pixelated blurry mess of people partying at night, zoom on white 4 pixels*

"We could clearly see Alice in the back on her knee, burying something".

What? I didn't see that at all.

Also, when the neighbour appears in one of the video faked by the brother, we only see a still image of his face. If it's a video, how did he come in and out of the frame? Was he just standing still for hours? This is the kind of details that made no sense.

If the brother was into photography, why did he use such shitty camera and tapes? All the video footage looked like old degraded tapes. I filmed a lot in the late 90 early 2000 with a video camera and it never looked so blurry and "wavy".