Lefebvre says he bought his boat with a viager and that he was lucky because the owner died six days later. Under French law the seller must live for at least 20 days after the contracts are signed.
In the scene where Mathias comes back from his night 'on the bottle' on the banks of the Seine and while chatting to Mme Girard, he picks up a bottle of red with a screw cap and starts drinking from it. Screw caps in France in 2020 are still very rare and Mme Girard, who is a wine connoisseur, would never have any imported wine which may have a screw cap.