When explaining sexuality Teacher Frank brings along a Playboy-Bunny, something that no teacher would bring to sexual class, since Playboy is an erotic magazine which is illegal to show to under-aged children, as seen in the movie, and has nothing to do with actual sexual intercourse from the biological point of view.
While the plot is clearly set in the EU (the family is warned to pay a price in Euros) but when Frank is picking up Kosima his car and various other cars in the movie have Swiss license plates.