Well, I have some perplexities, either about the comic book universe and/or the movie universe:

1- Are the X-Men paid/remunerated by Xavier in some ways? Or do they just live in a sort of "communal way", with Xavier paying for food and clothes on a basic level?
When you become an "X-Man", you don't need to work (in the society) anymore... right?

2- How did Xavier manage to "hideously" host X-Men from other countries (Storm, Colossus, Nightcrawler, Banshee) without facing some legal consequences or issues?

3- Who or what creates the X-Men's costumes?

4- Are all X-Men legally registered as "teachers" of the Xavier's School, in a similar way to the movieverse?





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The main X-Men universe (X-Men + Wolverine) has been altered via time travel twice, not just one ("Days of Future Past").
This means that the timeline depicted in "First Class" (1962), "The Wolverine" (2008) and the post-apocalyptic future of "Days of Future Past" (2023) was already a massive divergence from the original, untampered version of history (the X-Men trilogy).


X-CONTINUITY
http://x-continuity.blogspot.com


There are extensive sections explaining more about incongruences and contradictions in the saga.
According to my scenario: Sebastian Shaw (Kevin Bacon) was a time traveler. He was born several years after the events of "The Last Stand", in the original timeline (X-Men Origins: Wolverine; X-Men; X2; The Last Stand).