During the first scene in the bar, there is a chess game on TV. The seated man is asked why he is not watching it. He replies, "The moment he moved his rook to B9, he s**t the bed." A chess board has no B9 square. There are only 8 rows on a chess board.
Several of the flags at the U.S. Embassy are hung incorrectly. The canton (blue field) should always be in the upper left corner. This could be intentional within the fictional world of the film: the imaginary Romanian filmmakers may have been unaware of U.S. flag-hanging conventions, or may have knowingly hung the flag backwards to subversively mock the inept embassy staff.
At the start of the episode (at around minute 3:47), when Gregor and Nikita are first seen in the car, a modern Renault Megan can be seen driving by in the opposite direction.
Baciu reads an issue of Guns & Ammo magazine with a correct early 1980s front cover; however, the back cover is a thinly disguised yet recognizable 2010s advertisement for a pistol with a prominent black actuator button for Crimson Trace Lasergrips, a type of laser sight not introduced until the mid 1990s.
Gregor misquotes Marx, saying "To each according to his abilities, to each according to his needs." This actual quote is "FROM each according to his abilities, TO each according to his needs."