Somebody researching this show got lazy and must have Googled the Russian flag for the space race segment. They show the red, white and blue flag of Russian Federation, adopted in August of 1991. In the 1950's and 60's, the "hammer and sickle" flag was the symbol of the Soviet Union, originally adopted in 1923 and used until the early 1980's.
Any teachers using this show may want to review the content and note errors for their students. Other than this, I did not notice any other particular problems or errors and the show is written and produced in a form which is interesting and makes a good introduction to the material.