The Foreshadowing Moon
Of course, nothing beats the feeling of watching the big revelation in the movie for the first time. But when you re-watch afterwards, you notice all the clues you missed before that led to the special moment. In the first movie of the Pirates of the Caribbean series, the nature of the curse of Black Pearl is shocking revealed. When you watch the movie again, you will notice how the moment is foreshadowed when the first shot of the moon is followed by a shot of a jail dog's bone lying on the floor.