I went on the Aperture Science’s website just for fun earlier and it shows footage of a Christmas decorated room from a security camera. I’m sure most people have already seen this and when I did originally I never really thought much about it. But I noticed the two socks and the Portal 2 cubes on the Christmas tree so I thought I should watch it a while to see if anything unusual happens. From what I noticed there are two security tapes which both show a Christmas greeting at the end and play a Christmas Portal theme song.
Read more to see the various clues for Portal 2 contained within the videos.