The cat in the dark basement is ginger; an homage to Jones the cat in Alien (1979), a film this episode make numerous references to.
Wilhelm Scream: Heard after Troy punches someone in a wizard costume after reentering the building in his construction mech costume.
A little after the 11:10 mark, you see Chang take his pulse on his carotid artery using three of his fingers: the pointer and middle (which is how you would normally feel the pulse), as well as the ring finger, which is NEVER used to take the carotid pulse, since the ring finger has its own pulse. Ironically, Ken Jeong, who plays Chang, is an actual medical doctor, who no longer practices, so this bit would not count as a "goof", but rather something the actor undoubtedly intended to do for Chang's character.
This episode aired October 28th 2010. Three days later, October 31st, 2010, AMC's The Walking Dead (2010) premiered.