In the restaurant, Caroline is heard commenting that the waiters do well, but see she's eating and not speaking.
Sophie's real name should be Zofia Kaczynska - note the proper feminine form '-ska' and not '-ski' (male variant). The form 'Sophie' is excusable as it's the premise for the pun on the film "Sophie's Choice", but as someone born and raised in Poland Sophie/Zofia would never goof up her own last name.