Ummm...yes, they do show/explain how the cards are marked.
As a prior note, since you have the effect, ask these type of questions in the private forum where you can 'chat' with others that also have this effect.
Anyway, click the 'learn' video and in the 'pop up' you'll see a film icon for downloading the mp4 and a 'pdf' icon for info regarding the markings.