A fake billboard can be seen out the window, advertising the film Der Schmerz Bitterer Tränen, starring Zarah Leander and Bridget von Hammersmark. Specifically, Leander’s face is visible. This fake film title might be a reference to the R.W. Fassbinder film Die Bitteren Tränen der Petra von Kant from 1972. (via Hyperreality in ‘Inglourious Basterds’: Tarantino’s Interwoven Cinematic World in 1940s France)