Hey. this movie is great but I wanna talk about something else. at the Episode 11 of Season 2, when Walter white went to jessie's house and took the Crystals himslef, when he (carrying the crystals) was leaving the house, someone was behind him and watching him at the Frame of the door, behind walt.
at first I thought that it could be a spy of Walter's enemies but when I watched all the season of the movie, I saw nothing refers to that Scene.
I searched too much about this but got nothing. maybe someone has seen it and can help me to figure that out.