This movie is incredibly ignorant...
.. The opening commentary in the movie is something along the lines of "This is the only night in the year where the whole world comes together to celebrate"
Anyone who knows anything about different cultures knows that there is not just the Gregorian Calendar and in those different cultures New Years is not only on a different day, but in a completely different time of year. They aren't even in the year 2011.
Obviously this movie doesn't speak for all Americans, but this shows how freaking stupid the writers of this movie were.
With how many times different people go over the script at different times, I'm not sure how the opening line of the movie has a factual error as huge as this. It set up the rest of the movie for failure.
In journalism, when a writer has any sort of factual error in their article they no credibility. This movie has the same problem.