Other mistake: During the dinner Slowik reveals that his restaurant does not have nor serve bread of any kind. Towards the end of the movie Margot requests that he make her a cheeseburger, which he does. Where did the buns come from?
Suggested correction: This mistake completely misses the point. The chef NEVER says they don't have or serve bread; merely that the guests will not be getting bread as part of his meal plan. The movie actually makes a point of repeatedly mentioning the fact that the restaurant is known for its high-quality bread and even shows us a plate of their bread for a few seconds. They have bread... chef is just messing with the customers by refusing to give them any with a pretentious justification.
Suggested correction: He didn't say they didn't have bread. He stated THEY wouldn't get bread for that evening, since it's a common man's staple, and they are not the common man. So, they get a breadless bread plate with nothing but dipping sauces.