i've noticed a few things that are kinda cool.
i don't remember where i heard it but in Chaos there is a radio playing the same music that is playing in SC1 in the CIA HQ lunch room.
in the seoul level,at the beginning there is a radio playing the same music that was playing in SC1 2nd chinese embassy in the spicy sticks resturant.
in SC1 at the beginning of 1st chinese embassy,there is a pair of red panties hanging on a clothesline above the street.
in Chaos penthouse level there is a few pics of a very attractive woman wearing a pair of red panties that look just like the ones in SC1 on the line.
what have you noticed?