The film is famous for de Funès' high-energy performance, particularly a legendary scene involving a "shadow dance" where he unintentionally mimics a German dictator while explaining a recipe.
It was released under several names, including The Big Restaurant and What's Cooking in Paris in the United States. Historical Context: Dining in 1966
If you are looking for information on the restaurant industry in 1966 rather than the film: Restaurant-ing in 1966