“My Heart Will Go On” is an episode that works on many levels – as a good, classical find-the-monster story, an interesting glimpse in an alternate universe and as a way to move the storyarch subtly along.
But for me, most important about this episode are the hints at just how different the life of Sam and Dean Winchester is.
Balthazar tells them that only the “small details” have changed, but looking at them, one gets the feelings that these “small” matters are bigger than meets the eye.
First of all, there is this scene.