Vehicles are too bright and shiny to be realistic, some of them might even be anachronic. For instance seems to me there is a green Opel Rekord A, produced in the period 1963-65, in a scene supposed to happen in 1961. But in general it is ok and, anyway, at least consistent with the era.
The general espionage ambiance felt a bit off to me, not even mentioning french secret agents that thought inconspicuous to drive a Citroën ID in Berlin. Dominic Cooper, enacting the main character, does not strike me as the the next James Bond, but what do I know, I am old fashioned.
Nonetheless, there is a Żuk parked there, in a scene with a buchanka.
That is nice. Well, obviously, said buchanka appears to me to be a UAZ-452, produced since 1965. A bit different from the UAZ-450 that existed in 1961.
A yeah, there is a Barkas B1000 also, in a March 1961 scene, vehicle actually produced only since june 1961.
There is probably a lot of other similar issues, if you look in detail and have a clue. Looks a bit like the show in general: not terrible, but approximative.