In October 2018, Swinton told The New York Times that Dr. Klemperer was played by Lutz Ebersdorf and Ebersdorf was played by her.
Pada Oktober 2018, Tilda memberi tahu The New York Times bahwa Dr. Klemperer diperankan oleh Lutz Ebersdorf dan Ebersdorf diperankan oleh dirinya.