I prefer focusing on what I like...
So, as an already-minimalist living easily in a tiny home with a kid, yadda yadda, what I liked about the doc was their process of publicizing an idea. As a person learning how to publicize an idea, I found that aspect delightful! As $200k mentioned above, I loved that they showed only a handful of people at their earliest events. I was taken with what people can pull off when free of specific types of responsibilities, or endowed with certain qualities (e.g., extroversion, endurance). I was taken with their specific form of friendship: the eternal buddy system, the mutual support day in day out for ten months, that there are two of them to work off each other and to absorb the questions and attention.
So, I doubt this was what they were aiming to support me around, lol, but that's the part I loved. I think this aspect of the documentary can be very helpful to those of us struggling to get our own word out or who feel "like a failure" for not succeeding in doing so (i.e., doing so takes some specific resources, which some have and some don't; that's not personal failure).
I also really enjoyed the sweetie-pie in the tiny house—really enjoyed her story and manner. I loved that they showed the Project333 lady, then clipped straight over to the abovementioned sweetie-pie referencing it in her life! So, the connections within the global community. That was cool.
Finally, while watching yesterday, I was struck that they felt no need to be fancy for their speaking engagements. When I was at a fancy ceremony today, I felt momentarily self-conscious about being under-dressed, even as a mere guest. Then I remembered these guys, laughed, and relaxed into my minimalism :)
Funnily, the doc had the unanticipated effect of making me yearn for...a larger (or more expensive) house! D'oh! Will have to shake that outta me again.