As the video starts the sound is diagetic as the girl in the video is listening to her head phones and you can tell by the quality of the music that it is coming from her. As Bruno Mars comes in the quality of the sound changes as it turns into non diagetic sound. He uses the tape out of the cassette to draw pictures the whole way through. This is an editing technique which could be done many different ways and looks very effective. When he is singing the song you can tell it is lip-synced as the sound would of been put over the top of the video and his lips always match the lyrics. They are both in normal clothes and in a normal setting as the song is a slow love song which is why the mise en scene matches the type of song. this video has a lot of post editing which makes it interesting to watch.