Other mistake: In the scene where George Clooney is standing in front of their house watching his wife leave for the book-signing tour, the front door of his house is open. You can see the trees inside the front door as if the trees are inside their house. (00:37:40)
Other mistake: The date on the surveillance footage from the camera in the Russian Embassy says 01.05.08, implying that it is either January or May (depending on which date notation is being used, American mm.dd.yy or Russian dd.mm.yy). However, it is fall/autumn outside, as there are dead leaves everywhere. And when Katie calls Harry we can see that his cell phone shows 17/9/08. (00:48:00)