The character which Jean-Claude Brialy portrays, Jean-Pierre Muller, was born in 1946 in the film, making the character approximately 55 at the time of production in 2001, while in reality, Brialy was born in 1933, making him approximately 68 at the time of production, a difference of 13 years.
The first credited character is named Jean-Pierre, but the next four credited characters all have names which begin with the letter "A," Alice, Armando, Antoine, and Ana.