When I taught pre-school in Malawi, we covered buttoning while learning about the letter B. I felt so proud (and relieved!) when all 21 of my four year old students were finally able button their own uniforms after our swimming class.
Want to see him in action? Oh, and don't worry about the monologue in the beginning. We rarely know what he's talking about! My only guess is that he was reenacting a scene from his kids monster truck show, trying to be like the host Harry (hence his bouncing and eye rolling).