Factual error: At the end of episode 6, we see Alain crossing the German French border in a European registered right-hand drive Citroen CX. Then at the very beginning of Episode 7, they check into a hotel and the Mercedes parked in the forecourt was also right-hand drive. (00:01:00 - 00:01:30)
Episode #1.1 - S1-E1
Factual error: When talking on the balcony about the jewels he just sold. Sobhraj states for an ounce they could be sold for 15,000 Euros. Obviously Euros as a currency didn't exist in the 70's. (00:35:26)
Suggested correction: He doesn't say "euros", he says "guilders." Guilder was the Dutch currency used in the Netherlands at the time.
Episode #1.6 - S1-E6
Factual error: The Indian police officer who arrests Sobhraj after the jewel robbery is a detective sergeant. The Indian police do not use the rank of sergeant. Head constable is the equivalent.