Audio problem: When Uhl arrives as Prince Leopold is practising shooting, he informs the prince that Sophie had spent the night with Eisenheim. The prince asks Uhl whether they were 'fornicating'. His mouth, however, is saying f**cking. (00:51:50)
Audio problem: When the ghost boy walks up from the audience, you can hear the steps creak as he walks up.
Audio problem: After the first night in his new theatre, Eisenheim walks towards a crowd, who ask him how he's done the trick. But none are mouthing the words.
Answer: Although the story is fictional, some of the details are based on the life of Austrian Crown Prince Rudolf, only son of Emperor Franz Josef. The painting of the emperor which Eisenheim creates is an actual portrait of Franz Josef. (from IMDb).