I find the most striking part of this short film to be the use of still images as opposed to film. I think it is a blatant representation of how our memories actually work. Our memories are not like a roll of film, playing out every scene we experience in perfect sequence but is instead like flipping through a book of snapshots from our lives, some pictures clearer than others and some not there at all. The fact that the characters went unnamed was also a characteristic of how the film creates realistic rendition of how memories work. We don't always remember peoples' names but we can remember their faces.
In fact, I've read that you cannot fabricate faces in your dreams, that every character in a dream you have is a person that you have at least seen once before in your conscious life. This is why I believe the snapshot of the woman in the beginning is so important to the man who is sent forward and backward in time. Although he doesn't know anything about her besides what her face looks like, he continues to return to her in his time travel which are in a way like dreams.