Despondent, Jojo hides until the battle is won, with the Americans occupying the city. As he wanders the city, he is seized by Russian soldiers alongside a wounded Klenzendorf. After a brief conversation, Klenzendorf tells Jojo to look after his sister, then tears off Jojo’s Hitler Youth coat and denounces him as a Jew to ensure the soldiers do not execute him. The soldiers drag Jojo away as Klenzendorf is executed by firing squad. Jojo runs home and, to stop Elsa from leaving, tells her Germany won the war. Recognising her despair, he recites a new letter from Nathan, claiming that he and Jojo have figured out a way to smuggle her to Paris. Elsa confesses that Nathan died of tuberculosis the previous year. Jojo tells her he loves her, and she tells him she loves him like a "younger brother". A disheveled Adolf angrily confronts Jojo for siding with Elsa, and Jojo kicks him out the window. Outside, Elsa sees American soldiers and realizes the Allies have won the war. She slaps Jojo in the face for lying, and then they dance in the street. Identical twins Gilby and Hardy Griffin Davis, younger brothers of Roman Griffin Davis, portray a series of "Hitlerjugend" clones in the care of Fräulein Rahm in cameo appearances. In March 2018, it was revealed that Taika Waititi would direct, write, co-produce, and co-star in the film, as an imaginary Adolf Hitler. Speaking of the context of the role, Waititi stated "It's my version of... a lonely boy's best version of his hero, which is really his dad," referencing the fact that the film's protagonist, a 10-year-old boy, is desperate to join Hitler's ranks during World War II. Later that month, Scarlett Johansson joined the cast to portray the child's mother, who is secretly anti-Nazi, and in April 2018, Sam Rockwell joined the cast as "a Nazi captain who runs a Hitler Youth camp." In May 2018, Rebel Wilson was added to play "a brutish instructor in the Hitler Youth Camp the young man has just been recruited to attend." Filming was set to begin in Prague shortly thereafter, and exterior shots took place in Žatec and Úštěk. Later in May, newcomer Roman Griffin Davis was officially cast as the lead, the son of Johansson's character, and New Zealander Thomasin McKenzie was added as Elsa Korr, the Jewish girl whom Johansson's Rosie hides in her home.