Video glitches

I think that is intentional, not a glitch.  If you want credit for watching the whole video, you have to watch every second of it.  (If you only care about learning the material, it doesn't matter if Khan registers it as a complete video.)

If your parent/guardian, teacher, or school cares more about whether you play the videos than whether you understand and can apply the concepts, I am sad that they have that priority.

~ Janice, KA user