Excellent presentation of the material, I acquired the book and did a little layer learning which was also very helpful. One annoying facet was more of a video production issue than a content problem. I believe the video camera was started and stopped too often causing a jumping of the image in the inset window of the instructor speaking. Or, perhaps the video was edited cutting out pauses thereby causing the image to jump.
I finally just ignored the inset window all together and concentrated on the subject matter.