Bienvenue chez les Ch'tis

We have a good movie about this part of France, but going to my bus stop, I met this poster on every tree of the road for attracting children...But there is a big french error, we say in French, "La Parade des Clowns et ses chiens comédiens.". Do you imagine kids who go to school and see this poster, they will write french with errors, and when you see the clown, I always felt scared by clowns, pointing his finger to you, kids will think the clown is right !Anything !