Basically the 'talking heads' have no idea how they will be used or edited so always a risky business for them.
What is the provenance of this 'documentary' ... did the 'talking' heads know what programme they were contributing to, or were they pirated from elsewhere?
The interviewees were fine and much as one would expect but I found the voice over to be totally inaccurate in parts.
I'm not quite sure what you mean by 'voice over'. Amaral?
One of the key facts that struck me was that the programme was narrated in a US accent. Presumably the original was aimed at a target audience of the US and Canada, but I don't know. It could be anywhere English speaking.
It's no worse than many of the offerings on the subject. I consider that most who have studied the case would find the flaws.
But most people on Planet Earth have not put time and effort in researching the case, and for those, it was much better than nothing.