I just watched the first three chapters and had a few comments that I thought I would pass along.
I noticed that the default flow for overspending (i.e. the red down arrow) was not explained in the first two chapters and I think it should be. In the third chapter about how to handle credit cards actually shows turning the red arrow to the right and mentions that it's changing from the default in passing, but I thought it was really odd to show how to modify something before explaining how it worked. This red down arrow is a big part of YNAB and needs to be more clearly explained earlier in these presentations.
I was wondering if any thought had been given to using the whack-a-mole process to transfer overspending from a budget spending category to the pre-YNAB-debt category for the same credit card. I understand that this would grey the line between old and new debt, but since debt is debt it might as well be all in the same place in the budget. It seems a bit dangerous to turn the red arrow to the right for multiple categories that all relate to the same credit card.
I did learn a lot about how YNAB is designed to work so now I'm better able to assist others. I was watching the video's before recommending them to a friend that I have passed the tip about YNAB to.