Cultural Notes in the Adventures In Japanese text books

My Idea is for there to be More Cultural Notes In the Text Book. The Notes should include not only the cultural notes on the languge but on some of the vocab words. These notes could include just fun notes about the vocab. EX. Hontoo(true) on japanese game shows people show they are answering true questions by coneting their hands over their heads forming an O, also to show the answer is false they cross their arms forming an X.