Big plot hole
We are to determine the blackouts happen as a result of Old Evan coming back. Second time through, we see the "reasons" why we see certain details when Young Evan comes to: ie: Tommy disturbingly twisting the doll in the basement, why his dad was attacking him, etc.
However... why are we seeing the blackouts BEFORE Evan changes the traumatic events? What I mean is, the first time through, we witness the blackout from Young Evans POV, and then we understand a traumatic event happened during the blackout. Then Young Evan comes to and faces the immediate consequence of the event he has no memory of.
Which means Old Evan came back to this moment in time to....let the traumatic events play out??
Doesn't make any sense. I like the concept, but there's a lot in this movie that doesnt hold up to scrutiny.