The Happiness of All Mankind - S1-E4
Factual error: When Bachu talks to Pavel during their lunch, two bottles of vodka are visible. Top of the bottle should read: RUSSKAYA, however, it's misspelled and reads "RUSSKAVA." Other issue with those bottles - in the center it should read in Russian "Русская Водка", however, although "Водка" spelled correctly, the "Русская" is misspelled and ends on "ерская", which is incorrect. (00:30:26)
The Happiness of All Mankind - S1-E4
Continuity mistake: When Legasov proposes to use Bio-robots, Scherbina pours 2 glasses of vodka. One glass is about 80% full, another 60%. However, when glasses are placed on the table, they appear to be both filled to 80%. (00:39:27)