Based on the book of the same title, by Blake Crouch.
This is Jennifer Connelly's third appearance in a production named Dark [something], after Dark Water and Dark City.
Nine minutes into episode two you see Jason coming down the stairs and finding the loose door post. This is a tribute to Jimmy Stewart's movie. It is a wonderful life. When George (Stewart) is barreling down his tunnel of despair, he arrives at home and accidentally pulls the loose top piece off one of the stair posts. This is evidently something that happens all of the time in his old house, but it especially irritates him this time. In the middle of an epic financial crisis, the beat-up staircase with its broken post reminds him of everything he doesn't have.