At the wedding, the clergy kiss each other, then one kisses Carrouges, then he kisses his bride. This was a real practice in a medieval Nuptial Solemn Mass; the "kiss of peace" was given by the priest celebrant to the deacon, who in turn gives it to the subdeacon, who gives the kiss to any other clergy present in choir dress, and it is also given to the groom, who then gives the kiss of peace to his bride. The kiss of peace was also given to royalty, if present at a Solemn Mass. At modern Catholic Masses, the sign of peace is usually a handshake, exchanged by all people present at the Mass.
Jean de Carrouges was born in the 1330s and Marguerite de Carrouges was born in 1362. They married in 1380. Thus Marguerite was 18 at her wedding and Jean was more or less 45. Also, Jean de Carrouges and Jacques le Gris were about the same age and were both squires and eventually knights, but at the time of the duel, Carrouges had participated in many more battles than le Gris, thus it can be surmised that he had better fighting reflexes and experience.
Matt Damon struggled to grow facial hair, so the makeup department had to try out 20 different beards to apply to his face. He reportedly got a skin rash underneath the stuck-on beard, which was so irritating that he had to be treated with ice packs after every scene while shooting the movie.
The film gets its title from the fact that the duel between LeGris and Carrouges was one of the last trials by combat in France. The actual last duel occurred in 1547 opposing Guy Chabot de Jarnac against François de Vivonne.
In a scene early in the movie, Sir Jean de Carrouges (Matt Damon) kneels before Pierre d'Alençon (Ben Affleck) and asks for his approval. Pierre d'Alençon, on the other hand, annoys Jean de Carrouges by saying "closer" to him. Damon said that this scene was improvised and that Affleck's line added at that moment was loved and put into the movie by director Sir Ridley Scott.