One of the very few episodes in which characters' relatives or people from their past have a role in the movie, in this case Rainer Franck's ex girlfriend Alma Becker (Sabina Trooger). This is maybe the deepest view into Dr. Franck's private life of the whole series. This will be a little more common in later seasons with Dr. Lessing.
Only episode in which Dr. Franck is seen driving a car not being one of his usual BMWs, in this case Alma Becker's Ford Escort Cabrio Mk.III.