the camera moves too fast sometimes, causing it to be blurry - slow it down and then speed it up later on your computer to get a clear picture (or just get a picture and slide across that)
avoid saying "and" and "again" (or just reduce how often you say it)
during 1:30 to 1:45, 1:50 to 2:05 the movement is too fast for the camera - either slow it down so the camera can record it properly (in focus and not blurry), or take a picture, it's hard to watch
I'm on a page about incorrect corrections, and spent the better part of like two hours trying to get someone to understand that -5^2 = -25, not 25, and then that post had comments get reposted because that group is self sustaining, and that person was in turn trying to explain what I just explained to them. And I'm taking that as a victory