Some key scenes within La Jetee are:
The beginning scene when the narrator is talking about a little boy watching a man die at the airport.
“Later, he knew he had seen a man die.”
Another key moment was when Paris got destroyed and so everyone began to live underground.
“And sometime later, Paris was destroyed”
“The survivors settled underground.”
Another key scene is when he gets chosen to be an expreimentee.
“One day, from among the prisoners, they selected the man whose story this is”
There is also times where you see the imagery of what is going on inside his head.
“On the tenth day, images begin to appear, like confessions.”
Then he is taken back onto the jetty as of where he saw a man die as a kid to see the woman he wanted to be with and then realised that it was his own death had seen on the jetty not some random mans.
“But when he saw the man from the underground camp he realized that one cannot escape time, and that this haunted moment, given him to see as a child, was the moment of his own death.”