Iron Man 3 spoilers:
In Iron Man 1 Tony is captured by the 10 rings terrorist group. In IM3 we see that Aldrich Killian is actually the head of this group. Does this mean the Killian was working to get back at Tony all those years ago? If so I think it would have been important for them to have at least mentioned it, as it is you hav to pay close attention to realize that its the same terrorist group. If not it seems like a huge error.