Dragons live by the Nazi's standards of racial purity, not allowing half-bloods such as Nepomuk into their city of Sorrowland. In the city, Mrs. Grindtooth teaches racial superiority to the abducted children. Author Michael Ende chose these topics because he has disagreed with this ideology since before World War II.
With a budget of almost 25 million EUR, this film (as of 2018) is the most expensive German motion picture ever made.
The misspelled address on the parcel that Jim arrives in is due to the fact that each of the thirteen pirates that make up the pirate gang called the Wild 13 only know one letter. Whenever they have to write something, the Captain reads out the message slowly and when a pirate recognizes the one letter he knows, he writes it down.
Possibly the most famous interpretation of the book by Michael Ende is the version by the Augsburger Puppenkiste titled Jim Knopf und Lukas der Lokomotivführer (1977), starring marionettes instead of real people.
Although toned down in the movie, in the book, Jim refuses to learn how to read and write. This mirrors Michael Ende's own personal experience. The Nazis were trying to teach the author, born in 1929, these things, but he was horrified by the messages they wanted to convey. He did not subscribe to the ideology of racial purity and racial superiority.