http://www.gamesradar.com/f/portal-2-ea ... 2135583053
Notable Topics:
Radio transmissions that can be decoded into pictures.
Oracle Turret
Half-Life References
Potential Family Genealogy (Turret song translated, mind blown) (highlight to see possible spoiler)
Greek Mythology in Portal 2
Tons of extra voice over work from Cave Johnson and Nolan North (SUPER hilarious)