The opening credits feature Nicole and Hugo as well as their photographs. However, they don't appear in the film at all. Instead, Jacques Raymond and Lily Castel, who were the ones who went to Eurovision in Dublin in their place, appear, but they're not credited, which leads to think that the filmmakers forgot to replace the credits on the documentary or mistook Raymond and Castel for Nicole and Hugo.
Séverine's filming session in Dublin's port took four hours to be made. She was freezing the whole time and ended catching a cold that forced her to stay in bed, unable to sing, missing one day of rehearsals for Eurovision.