Good catch Andrej. You are correct. The arrow should point from the extension towards the use case it extends from. In the Store Manager use case diagram in the Analysis Model, the direction of the <<extends>> relationship needs to be reversed.
Good stuff Clint! I really liked these screencasts. Good refresher.
It's only Low Resolution video...it's really frustrating. I find myself relying on what Clint is saying to figure out what is happening...and the volume is too low. Got my laptop speaker cranked, the video volume maxxed out and still having trouble following what is going on :/