Throughout the run of the series there was a large globe of the world used in the UNCLE office. However, it didn't appear to be current as it seemed to be from the middle of WW II. The colors for Europe seemed to reflect the conquests by the Axis powers, as well as the occupation of parts of China and southeast Asia by Japan.
The map upon Mr. Waverly's office wall is incorrect in numerous cases. For example, it shows Canada and Newfoundland to be 2 separate states, which they were until 1949. Other errors include the lack of East Pakistan and all of Indo-China is depicted as one nation by the name of 'Siam'. This map appears in various episodes. East Pakistan was founded in the late 1940s, and Siam split up in the 1950s; Siam then became Thailand.
The stunt doubles for Robert Vaughn, David McCallum or other actors can be spotted in scenes, especially when driving or fighting.
Ilya's Russian accent is not accurate. (David McCallum did not undergo accent training to make it sound fluent).