Roman Grynyuk cameo was a last minute addition, filmed on a iPhone after the main filming wrapped. It received an ovation during the premiere.
Due to Mykola Yeriomin's camera failing constantly, some of the sequences were filmed with two different iPhone cellphones.
Mykola Yeriomin: [homeliness or cosiness] McDonalds sequence, also a man and a dog peacefully sleeping on the lawn.
Mykola Yeriomin: [scene in which song corresponds nearly shot-to-shot to what is going on when it plays] "Sharik" and "Student".