On the Boston level, there are two apartments you can bust into through their windows. In one a man is dancing to seduce a goat. In the other, a fat nerd is watching TV and you can press a button to "feel the power". He then acts out the lightsaber fight of Darth Maul and makes lightsaber noises with his mouth. This is based on the popular "Star Wars Kid" video circulating on the internet of a similar looking kid who taped himself doing the same thing just as badly only to have people find the tape and spread it all over the web.
In the level Skatopia, you can unlock "Bigfoot" as a secret skater. "Bigfoot" is a reference to Chris Hasslam, pro skater who rides for "Almost - a skateboard company" as well as Rodney Mullen and Ryan Sheckler