American Gigolo quote
In the movie at 1:08:40 Dieter awakes and walks naked to the window. That must be an intended quote from American Gigolo, where Richard Gere does the same. (after all: they share their profession).
The scene from American Gigolo can be seen here:
http://www.youtube.com/watch?v=Bd0vpKsWn-U from 2:34 onwards.
What do you think?