Continuity: When Pépé remembers the moment when the Old Man told him how to become wealthy, the Old Man is exactly as old as when he meets Garriss decades later, shortly before he dies.
Factual error: Riton makes some money as a Coca Cola-style Santa Clause, but this figure was created in 1931, that is one year later as the film is set, and still needed many years to make its way into France.