Maybe we should just wait until Spencer has seen the letter. Maybe some of these memories never really happened and that's the code. Only Spencer can tell which of these memories happened in reality.
I just found TheResa's youtube-page. Her name there is lonesomesomeone, but the videos are the same.
http://www.youtube.com/profile?user=lonesomesomeone
What do you think? Who's this girl? Some kind of new ceremony girl? A little bit late, huh? Or just some kind of new cassie...? I don't really get this video. But I like the music.