Factual error: Supposedly the holders of the mystery briefcase are holed up in Nice; but when De Niro and McElhone go to check out the bad guys security arrangements at their hotel, the hotel is in Cannes (believe me) and the Michelin Green Guide that De Niro is carrying is opened to a map of Cannes.
Factual error: In the scene where Sam & Deidre are sitting in the Audi spying on the villa, you can see that the car steering wheel is a 3 spoked sports type which is right for that model. Later just before Larry smashes it into the Citroen outside the cafe, there is a close up of him as he comes out of a side street, you can see that the steering wheel is changed to that of 4 spoke design used on the normal A8 and not on the S8.
Factual error: In the scene where the bullet is removed from Robert DeNiro, he notes that it was sprayed with Teflon and claims that this is why it has penetrated the "bulletproof" vest. This is incorrect. Merely spraying a regular bullet with Teflon will not make it pass through body armor. Armor piercing rounds must be constructed of extra hard materials that will not deform, and usually have pointed tips to spread the fibers of the woven material of the armor. The myth of Teflon bullets came from an early round by the KTW company which used Teflon to protect the gun barrel from these extra hard materials.