Dead Cell's bomb expert is called Fatman. The character was named after "Fat Man", the codename of the atomic bomb that was detonated over Nagasaki, Japan in 1945.
Raiden, do you actually enjoy abusing helpless animals?
Rosemary: I don't believe it! I had no idea you were that kind of a monster!
Colonel: I don't understand you. But if you're satisfied, then get back to the mission.
After the credits roll, and is a classic piece in all Metal Gear Solid games, is another radio call from Hal Emmerich(Otacon) to Solid Snake noting about the forefathers.
The European PlayStation 2 version comes with _Document of Metal Gear Solid 2, The (2002) (V)_, an interactive PS2-exclusive documentary of Metal Gear Solid 2: Sons of Liberty (2001) that is not included with the other versions (outside Europe, it can only be purchased by itself).