User blog comment:Argorrath/Sledgehammer Games claims to be working on a new MW game/@comment-11942878-20130718130559/@comment-3171236-20130719033620

The thing that's wrong with the continuity of Black Ops 2 is that it has some obvious retcons/changes in the story arc, with no explanations regarding them.

Operation Charybdis, Mentioned in the last piece of intel in Black Ops, is never mentioned nor alluded to in Black Ops II, leading to the conclusion it was retconned, as was the character Weaver.

If the player chose to spare Mason, he returns in the ending sequence, apparently being gone for 3 decades, with no explanation why.

After Menendez shows the self-destruction of the drones, he calls upon Cordis Die to take action and begin their revolutions. However, the revolutions are only shown in the endings where Menendez was killed, and it is assumed there are only revolutions going on because he was assassinated, not because he directly ordered Cordis Die beforehand to start the revolutions.