The version linked to is from 2018. Here's the current version (April 22, 2019): https://www.sec.gov/Archives/edgar/data/1655210/000162828019...

Things that stood out:

They buy this pea protein: https://www.roquette.com/product-overview/proteins-and-deriv.... Have committed to $22MM of protein (from 2 vendors)

Founder owns 6%

Co-manufactured by https://www.clwfoods.com/ and http://www.fplfood.net/ (seemingly typo'ed in the S-1 as FLP)

The burger was 70% of 2018 revenue and 48% of 2017 revenue

Q4 gross margin: 25%, up from ~0% a year prior

R&D: 63 food engineers