What I found shocking was that Phil never really changes in the movie. He doesn't become another person, a person people know but a completely different person. Because he starts to learn and notice what's happening outside of himself. He is like a god in the movie, who can live forever, but cannot have any influence or impact on the lives of others, or even on himself. Then he understands that he doesn't know how to be human and act as a normal human being. If we learn to do one new thing every day, the days will be different and each thing will have its own purpose. Even if the same day happens a thousand times for Phil, he lives a different life each time.