When Vinz begins to cut Said's hair, he has the razor at the back of Said's head. Said stops him because he has cut too much. Yet when Said takes the cap off his head later in the day, the left side of his head has a big patch of hair missing, not the back of his head.
The trip across Paris is strange: the three characters should arrive at the Saint-Lazare station (north-west of Paris), coming from Chanteloup Les Vignes. Yet, when they arrive, they are in front of the Montparnasse station (south of Paris), on the Rennes street. Then, they go to Asterix place, on the boulevard Pierre Ier of Serbia, close to Iena Place (west of Paris), and when they try to catch the last train, this time they are at the Saint-Lazare station, the right one to go back. But then, when they are on the roof, they see the Eiffel Tower and the Trocadero from the south-east, being probably close to Montparnasse station. Then, they come across a sculpture, L'Ecoute, in the Halles Garden (center of Paris), before going back. Hence, their trip goes: south, west, north-west, south and center of Paris.