Oliver North is a retired United States Marine Corps Lieutenant Colonel who assisted in the production of Call of Duty: Black Ops II and makes a minor appearance in the campaign. North portrays a fictional version of his younger self, accompanying Jason Hudson to Alaska to ask Alex Mason to assist in the rescue of Frank Woods.
Ed Harris voiced the character Jason Hudson in the first Black Ops, but Michael Keaton provides Hudson's voice in Black Ops II.
The character Manuel Noriega is actually a real person. In fact in July of 2014 he sued Activision for the false portrayal and use of him in the game.
Despite Gary Oldman still being credited as the voice of Viktor Reznov, he is only briefly heard as a memory on the level "Old Wounds". Viktor Reznov is only seen briefly on the same level as a flashback.
In the zombies mode "Tranzit" there is a hidden area in the corn field. It is a building from "world at war zombies"