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One thing that sticks out to me in that video is that they seem to grab the seat like a handle a lot. I'm not sure why this surprised me, as it seems pretty natural, but for some reason it never occurred to me that unicyclists might do that. It almost looks like it's a pogo stick with a wheel when they do that!

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Apart from keeping the pedals against your feet when jumping, holding the seat also allows for pulling down to put more torque on the pedals, like standing and pulling on the handlebars of a bike for when you need more force on the pedals than your weight.

He says in the video "My left arm maintains the brake" @ 1:26 in. So I assume there is a brake lever there along with the other comment saying it helps keeping the bike close during airtime.

Yes, I used a brake as well. It can help with stopping quickly but only with much practice (well, stopping isn’t hard, but doing it comfortably). A brake also helps to drag on hills so as not to fatigue the legs and knees. Some in my group used a shift lever to operate the brake, carefully increasing until the right amount of drag was reached for comfortably going downhill.

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