Not that I don't have nitpicks. Mostly that the bad guys were taking some actions which didn't seem to lead to their goals. The willingness of various law-enforcement types to cooperate with the bad guys seemed a bit much given where things stood at the time. But that's more me disagreeing with the author's judgement calls than errors as such.
What bothers me most is the meta-meaning being assigned to all of this by the book's author and fans. Here's the bad guys in the book: appeasing Hitler to gain peace, hating Jews, and trying to keep the common folk from getting good educations. I'm supposed to recognize them as stand-ins for George W. Bush, who prefers war to lifting sanctions on a tyrant, promises rabbis that it's his job to make sure the US isn't too late to stop the next Holocaust, and pushes "No Child Left Behind" to focus on educating kids at the bottom, not the ones on top. Those really, really don't match.