Thanks for reminding me! I was meaning to give that a try. I think his prices have come down since I last saw them.

Another way to train yourself would be to review videos in slow motion after you've made a guess.

If it's lie detection you're after, maybe just a basic lie detection game with someone, where you both had videos you could rewind and review, would work.

I had the same feeling as amitpamin, that the corpus he'd supply was too small. But it might give you enough of an idea to move on to looking at videos in the wild yourself.