At around 16:50 there is a Dutch address visible, but the way it's written is not the correct way in The Netherlands.
44 Den Burgstede should be Den Burgstede 44.
44 Den Burgstede should be Den Burgstede 44.
In E2 at 42:02 this Knippenberg opens a diary of Willem Bloem, that holds an address in Amsterdam with a postal code.
Postal codes in Holland were not introduced until 1977.
When Herman is on the phone calling embassies, his desk phone is not connected. The lead is clearly missing from the backside of the phone. Further, the telephone is a touch-tone model not likely to be in use in Thailand in 1975.
When Monique/Marie-Andrée refers to her home province of Quebec, she pronounces it "Kwe-bec." No true Quebecois would ever pronounce it this way; they would use the correct pronunciation "Ké-bec."
Around the 14 minute mark, Marie-Andrée flies to Bangkok to reunite with Sobhraj. A sign identifying "Bangkok" airport is shown. However, the previous shot shows her plane landing on a runway flanked by a narrow canal with small mountains in the background, features that do not exist near any Bangkok airport past or present. It is in fact Hong Kong's old Kai Tak Airport.