A lot of the US soldiers are equipped with M16A4 rifles, although this weapon did exist in early 2003, it was not yet widely fielded with the US Army.
Coalition forces are shown using M60 Patton tanks; no member of the Coalition was using them in early 2003 (the US having long since retired them).
When Attilio is stopped by US soldiers near Baghdad, a tall mountain range can be seen in the background, when there are no such mountains anywhere near Baghdad.