When Yakushin's men are assembled, the black vans have Russian plates (with white characters on a red background, used for diplomatic cars). In the next shot, while traveling in a convoy through what is supposedly Moscow, Hungarian license plates are clearly visible on the vans (the scene was filmed in Hungary). When the convoy arrives at the GRU, the vans have Russian red plates again.
When Janet comes in with Clint he turns off the monitors, however the the back light of the monitors is visible later on, so they aren't switched off.
Carry climbs the ledge of a building in Moscow, it has the Hungarian and EU flags clearly visible.
When Carrie is on the ledge, we see a very large hill/low mountain in the distance. Moscow, however, sits on a flat plain with the closet mountains--the Urals--over 800 miles to the east.
As the convey of Russian vehicles travels across the city to retrieve Simone Martin, street signs clearly show the junction of Andrássy Út and Izabella Utca, which are in Budapest in Hungary not Moscow in Russia.
Upon their arrival at a Moscow hotel, Saul and Carrie are told by a CIA agent that they were staying in a "clean suite" that had been swept for surveillance. This is absurd and the CIA would never declare such a thing. In fact, almost all of the U.S. Embassy in Moscow is considered vulnerable to surveillance. Only a certain soundproof, secure room at the center of the U.S. Embassy is considered free from Russian government surveillance, and thus, sensitive material may be discussed there.