I assume most people that drew bicycles have ridden one, but there are a few basic common mistakes. The location of the pedals (closer to rear wheel, very near to floor), the way the chain operate, and the triangle frame are some examples. I did not notice anyone drawing details around the gear mechanisms nor the breaks. Many people demonstrated acceptable drawing technique while getting mechanical details of the bicycle incorrect.
I think this exercise highlights a great amount of ignorance around bicycles. I purpose society would benefit from better bicycle education. Better bicycle education might encourage bicycle adoption (needs testing to verify), and bicycle ridership improves climate change, obesity, traffic, and heart disease. In addition to increased adoption, bicycle education would improve bicycle safety.
Bicycle education as a semester long optional course in high school is a great reach goal. It could mirror driver education where teenagers learn traffic rules and laws, and also basic bicycle maintenance. Perhaps with enough active bicycle riding time it could count as a Physical Education credit.
A good first step would be more high quality videos and pamphlets on the topic of bicycle education.