Revealing mistake: When Jean Reno and Vincent Cassel approach the hanging body of Jean-Pierre Cassel in the doctor's house, the hooded killer can be seen standing to the left of the screen. [Not visible on the VHS version, but on the widescreen DVD].
Revealing mistake: In the opening credits sequence, the aerial camera pans over a ruined castle and the BMW with Jean Reno comes into shot ~ it is obvious that this car starts from just under the castle and was not travelling along the road before it came into shot.