The Monégasque authorities having turned down the production's filming permit requests, the film's Monaco-set portions were actually shot in nearby French locations.
Karina Testa was 30 years old during filming, although she is portraying a teenager.
Pierre Lottin portrays Willfred, the oldest son in the family but Sarah Stern is actually older than him, even though she plays his younger sister.
Pierre Bellemare refused to get paid for his short cameo. Instead, he asked for the money to be sent to a charity.
In the scenes where Jeff Tuche is visiting the different mansions, he is wearing a T-Shirt saying "Hilfe, mein Freund trinkt" (German for "Help, my friend is a drinker").
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