Anfänge und Enden

The song that is playing as Magnus enters Benni's trailer is Falco's "Jeanny". In episode 3 of season 1 (in a scene from 1986), this song is being discussed by Katharina and her friends in the hallway at school. It's remarked that the song is about "a man who kidnaps a girl and takes her to the forest just because she's wearing red lipstick. In the end he kills her." The song was banned by some radio stations for its content, but nonetheless it was a huge hit in European countries that year.

(at around 47 mins) We see Jonas crawl through a small hole in the big concrete wall. When he touches a piece of rebar with his back, it is revealed to be a flexible, spongy prop.