Nice video, Marcus! I've never seen runout adjustment of the clutch disc before like they show. Good idea if the tooling is available (or can be improvised)!
It kind of made me cringe to see an impact wrench being used to thread the transmission-to-engine bolts in, though. I supose when the transmission is dangling, you want something that works quickly. Probably there is little risk of cross-threading.
I wonder why they marked the inner cv joint to drive flange? I doubt the cv joint and transmission output flange would be balanced or otherwise indexed together, so it seems like maintaining the relative "clocking" isn't important. (To me, it seems like lining it up wherever the bolt holes were available should work fine.)
Finally, that's a slick tool they have for locking the flywheel.
Edit: one more thing - why would he loosen and then tighten the transmission fill plug? To make sure there is fluid in there? (But then, as the fluid seemed overflowing, it couldn't have been an accurate fluid level check?) I don't get it.