I loved the hair. The 70s was all about hair! I think you may have been too early with the VHS tapes though. What, no Betamax?
Also too bad you didn’t have a white belt and massive belt buckle to go with your outfit.
In 1979 I was riding a 24" Schwinn on dirt trails. Though George and Kris were the two best known faces of early MUni, I was doing it a few years ahead of them. My Michigan terrain didn’t have much on Seward or Vancouver, but that was a good thing for my primitive hardware of the time. 
Your unicycle is a Columbia, of course. Duh.
Have you had it all these years? Here’s some info about it. Columbia is America’s oldest bike company, and that frame was made in Ashtabula, Ohio at a factory that was well known for making bike forks back in the day (an Ashtabula fork). The seat is from Messenger, which I think was based in MA. That company also made the classic Schwinn seats from 1967-83. The tooling for those was later purchased by Semcycle. But your rectangular seat was the more generic one, of a type found on many unicycles of the 70s. Your saddle is in amazingly good condition. Want to sell it?
I have a similar Columbia, but the hub and tire don’t match yours. I bought mine used, so I don’t know what year it’s from or what modifications may have been made. The seat on mine looks like most of those old Messengers did after somebody learned to ride on it; the metal base is sticking out the front end like a tongue. My Columbia also has a fairly narrow rim and tire. Not sure if that’s original either, but it would be lousy for riding over the rocky trail in your film.
Oddly enough, in 1978 my brother and I had started to film a story that played off the same scene from 2001. It was to be the lead-in to a space battle between Coke bottle spaceships, with a Coke machine space station, choreographed to Holst’s Mars, the Bringer of War. It started with me buying a Coke, in a glass bottle, from a vending machine, sitting down on an old car seat in a junk yard and looking at the sky, then chucking the empty bottle at the stars. It was to have then cut to the space battle, where the ships were coke bottles decorated with bits of old model kits to turn them into spaceships! A Star Warsy thing.
We only filmed that intro scene, with me as the actor. I was wearing bellbottoms. Whereas my early local MUni trail is now part of a parking lot, the old junk yard where we filmed that scene is now a golf course!
Great film Terry, keep it up! Someday I hope to get some of that old film digitized so I can be embarrassed by all of you watching it online. Dan Heaton has some of my early MUni footage (1980 or 81), but I don’t know if his “latest” film will ever be released…