I downloaded the documentary as well - at least the 3rd segment. Two thirds of the measurements of the featured men were legitimate and probably one-third were fake.
Jonah Falcon - 13" erect, 9# soft - that's true. Here's here on the board and
verified the length on the documentary
married man - true, he's long and thick. His wife has first hand knowledge
50-something gay male - 12" and quite thick. true. We saw him naked.
Omar ---> questionable. As a porn star, there is an incentive to exaggerate.
I would estimate 9 inches hard as opposed to his 11. There never
was a direct view, just a profile view of his cock. The rest is as he
reported.
California man (anonymous) - probably well-endowed, but there was no
exposure of his cock, so he could claim to have more length than
what he actually has.