IGN just released a cool video to supplement their review. It gets rid of some of the misconceptions about the game just being a series of traditional quicktime events (ie. press x to not die)
It shows the same scene 3 times, first with all the actions entered, second with half of them and finally with almost none. The outcome of the scene ultimately remains the same (although this is not the case throughout) but it really changes the feel of the situation and can have repercussions later in the game.
YouTube - Heavy Rain: Exposing the Truth