Of course things like ghosts exist.
There is two in my sisters house. Both are ok and do no harm. (ones even her born dead baby that is now 12 and is stuck there)
Authentic? Surprising for some reason, coming from you. My gf is really into this stuff. The EVP recordings are kind of funny to me. If you're never offered a suggestion most people just hear gibberish or something completely different. Unfortunately once the suggestion is in your head its impossible to forget.
The photo is scary as hell but then again humans are programed to recognize human faces. Think clouds and such... grilled cheese sandwiches... A pile of dirt.
These are two very well known psychological phenomenon combined to make for one hell of a video. Intentional or not its efing ingenious