Most of the outdoor scenes that took place in the woods were shot at the Fahrtechnikakademie Kallinchen near Berlin. This place is a former military testing area of the German Democratic Republic.
The date November 12th is also a critical date in Back to the Future (1985), being it a date in which many time-traveling decisions and actions collide.
The central motif of the series soundtrack mimics the "Doppler Effect" (a high pitch transitioning to a low pitch), perhaps alluding to the centrality of the Doppler family to the story.
The show was greenlit by Netflix in February 2016. The second season was ordered in December 2017.
The song young Ulrich is listening to is called 'Pleasure to Kill' by German metal band Kreator (from their 1986 second album "Pleasure to kill").