I watch a lot of these in school. Unfortunately, my school doesn't buy very many new videos, so the videos we do have are from the 1970s.
This poses a problem for some courses. In many videos the Soviet Union is still in existance. This is a common feature of most videos.
Another problem that is funny is the chessy 70s stuff. The videos will open up with a bad disco-type song that plays backround to a rainbow of colors forming a logo that looks very strange and, in a way, funny. If a commentator shows up, it gets even better. The clothes and hair styles, being foreign to most high schoolers, causes my entire class to lose it.