Someone mentioned the Thing's injuries from 1993 and it reminded me of one of the great continuity paradoxes.
You see, you first had March 1993's Fantastic Four #374, where Wolverine instinctively strikes at Thing with his adamantium claws, scarring the Thing badly (something I don't recall is did the Thing and Wolverine ever later address what Wolverine did to the Thing?).
A few months later, you had October 1993's X-Men #25, where Wolverine gets the adamanatium pulled out of his body.
So far so good, right?
Except early in X-Men #25, before the adamantium is pulled from Wolverine's body you get the following page (I threw in a little arrow to let you know where to look)...
I think that the preceding paradox might have been so powerful that it created the being known as Onslaught. THAT is how powerful continuity is!