X-Men Origins: Wolverine and X-Men: First Class introduced a few major continuity issues. Some of these have been half-addressed. For example,
When questioned of Havok & Cyclops' "brother" relation, “Yes, the time line is different,” Singer said. “It wouldn’t physically fit for him to be the brother of Cyclops. We take some liberties on that."
Is January Jones’ Emma Frost somehow the same character we saw in X-Men Origins: Wolverine?
Donner: No, she’s Emma from First Class. That’s who she was and she’s the real Emma Frost. I think January did a pretty good job of portraying her.
So there is no connection between the First Class Emma Frost and the one we see in X-Men Origins: Wolverine?
Donner: No … not really, no.
One of the ones that I can't find any retconned explanation for is Charles' seeming inability to explain how Magneto had found a way to block his telepathy during the first X-Men movie. (Sorry, the only script I can find online is an early draft, so I can't find an exact quote at the moment). During the final battle of First Class,
Charles clearly sees Magneto wearing Shaw's helmet, knowing that it blocks his telepathy.
Has this ever been explained either through supplemental material or another interview, or is this one of the gaping holes?