The piano pieces heard throughout the film are the work of Fryderyk Chopin, a Polish composer and piano virtuoso, who is regarded as one of the greatest musicians in history.
The hat bought by Benji is a traditional Polish highlander (Gorale) hat. It is worn by men living in the mountains in southern Poland.
The characters in the film visit the German concentration camp Majdanek near Lublin. Between 1941 and 1944, the Germans murdered about 80,000 people there, 59,000 of whom were Jews. The remaining victims were Poles, mainly members of the intelligentsia and the resistance movement. About 6% of the victims were children under the age of 15.
In Warsaw Benji and David eat the famous Polish soup called zurek. It is made with sourdough and has a slightly sour taste. It is often eaten with bread and eggs, and in Polish homes, it is traditionally served at Easter.
Jesse Eisenberg's sophomore directorial effort after When You Finish Saving the World (2022), both of which were produced by Emma Stone's production company Fruit Tree and had their world premieres at the Sundance Film Festival.