I just finished watching this series last night, shortly after I noticed this (potential spoiler) had appeared on twitter. It certainly adds credence to their documentary if it is infact honest.

https://twitter.com/TODAYshow/status/684373410038718464

(In the video attached to the tweet, one of the creators of the documentary claims they have since been contacted by one of the jurors from Steven Avery's trial, who stated they felt he was innocent however voted guilty as they feared for their personal safety.)