This video is kinda showing how Darcy and Elizabeth's feelings change towards eachother, which is the memory part. Their memories of eachother helped them to change their minds about eachother. Or that's how I see it. Elizabeth's memories fade in/out to white and are sepia, and Darcy's memories fade in/out to black and are grayscale. The music is "Memories" by Within Temptation. Enjoy!
(. I didn't realize there's already a couple P&P videos to this song. oh well. =] )