 The exteriors of the film set in Transylvania were actually shot on location in northern Slovakia, including the High Tatras, Vrátna Valley, Orava Castle, the Váh River, and Starhrad.The team filmed interior shots at the JOFA studio in Berlin's Johannisthal locality and further exteriors in the Tegel Forest.For cost reasons, cameraman Fritz Arno Wagner only had one camera available, and therefore there was only one original negative.