I've managed to find the picture on which the quiz is based, as can be seen by the identical sky. From this, it can be seen that all snow is painted on, and the two shop windows on the right with the guitar and crown etc. have been drawn in. This means that nothing in the windows happened to be there before, as was the case in previous years. Everything in the windows is probably significant.
http://s3.amazonaws.com/images.voyagetrek.com/14-st-rothenburg-germany_690x370.jpeg
What annoys me about these quizzes is that some of the TV programmes were only available to paid subscribers. There's one here that was only on Netflix. What chance do ordinary viewers have, except by cheating like us?