So I'm catching up on the All-New X-Men issues from early last year and on the one where the Watcher watches old Beast sleeping, he says that bringing the original X-Men to the present messed everything up and now the universe will have to reboot. Not even a spoiler warning.
There's also young Beast's blackboard trying to figure out Marvel continuity: the joke is that he can't, but if you look at the blackboard, the original X-Men's names are circled. So what Beast can't figure out is how the Marvel U can exist if the original X-Men didn't grow up to appear in all those crossovers (it can't). No idea if this explicitly stated later on, I just thought it was cool.
