It should go without saying, but I should say it anyway, that if you haven’t seen X-Men: Days of Future Past, you’ll want to save this for later because there are SPOILERS!
That out of the way, I thought this was a pretty good run down of some of the easter eggs going on in X-Men: Days of Future Past, including some that I didn’t catch. But, although he titles it Every Easter Egg in X-Men: Days of Future Past, I would guess it’s not every one.
Take a look: