I think Singer means he's going to try and fix some of the continuity errors that have arose in the films starting with X-Men: The Last Stand, being carried over with X-Men Origins: Wolverine and continuing with X-Men: First Class.
But aside from the ones I mentioned, which I think it's fair to say DOFP is unlikely to address given what we know about it so far, those things weren't continuity errors until First Class made them continuity errors. They didn't arise with The Last Stand to be carried over with Origins. There was nothing to carry over.
JacksonArcher said:Yes, it becomes apparent Xavier's consciousness was transferred to someone in the end credits tag in X-Men: The Last Stand, but that scene was really vague and I'm not sure how many people know that... if they even stuck around for that scene after the credits.
I've noticed the TV cable networks never show that scene when they show the film, even though they always seem to show the after-credits scene in Iron Man.
