In order to simulate the streets of Iran, we see charity boxes in almost every single shot of Tehran but charity boxes are no longer used in Iran.
The soundtrack of the series is not Persian, but Arabic.
Ali (Arash Marandi), who is an Iranian character, speaks with a completely wrong accent in season one. Like foreigners who have just learned Persian. Sub-characters also often speak with the wrong Persian accent.
Glenn Close's accent is terribly wrong in very scenes.
The character of Reza Boroujerdi is sometimes called Farham and sometimes Parham, which are two different names! As if the creators themselves did not know the exact name of this character.
All the Iranian character call Iran "Iroon" and Tehran "Tehroon" but this pronunciation is only used by migrated Persians living in the west(US and Canada) and not the locals .
In one of the very first episodes, a jet airliner is seen taking off and in the background at the holding point is a bright blue Southwest Airlines 737, which is supposed to be Tehran International Airport. Southwest airlines does not service international destinations like Tehran in Iran.