The clock, which can be seen several times, shows the dates "Donnerstag 25" and "Freitag 26". This points to the episode being shot in late April, about two months before airing. In the year 1985, 25th and 26th day fell on Thursday and Friday in April. The next possible occasion was in July, a month after airing, and the previous chance was October 1984.
Addresses (according to script):
The demolished house was at Seebacher 17.
Schnaiter's photography shop was at Rosenheimerstrasse 136.
The daughter of the Rotter couple was not credited. She was dark haired and dark eyed, six years old.
French title: "Nuit blanche".