I think a lot of the sections in these videos would have done very well as separate shorter vids. Specifically the frostfallen and the necrocraft sections could easily have been separate videos.
That's a valid point, though I felt it was important to explain every undead type in any guide to Animate Dead. Plus, other than what a bestiary would say about these undead types there isn't really more to say, and thanks to youtube chapters people can skip over any part of the video they don't feel the need to see.