I'm not sure what the point of the infidelity was. It didn't seem to do anything to any of the characters. Maybe it was just to get Susanna out of the house?
I don't think the time travel was necessary or made any sense. Nobody could see or hear him but he was able to write in a notebook?
I like Kevin Bacon in this more than I thought I would. His shocking twist was neither shocking nor a twist.
Basically watch the trailer where he measures the house and then make up your own story about how and why.