The QR code on the side of the cow in the first episode leads to the twitter page of Director General of Roscosmos, Dmitry Rogozin.
Ascaris was depicted by a vacuum cleaner hose, seen earlier in Russian Dune Special. There, the same hose played the part of Shai-Hulud, the great Sandworm.
There were only 3 professional actors in the Cyber Hospital episode - heroes in the ambulance. Denis Aliyev (Robinson) from part 2 is an amateur. The decision to cast him was spontaneous and happened on the day of filming. Denis memorized his lines on the spot and the team helped him prepare.
The fractal cucumber has the shape of the ISS.
Images inside the ear of Mitrofanov's patient were filmed using ciabatta.