Jaromír Hanzlík and Petr Kostka were considered for the part of Petr, eventually played by Jan Tríska.
Tereza Brodská's debut.
Final film of Jirina Hladikova.
The theatrical performance in the film is "R.U.R." It is a play by Karel Capek, a 1920 science-fiction drama about a factory that creates robots that work for humans. This is also where the word "robot" first appeared, and the whole world gradually adopted it from the Czech author. It was coined from the word 'robota', which is synonymous with serfdom.