There's a lot of **** that the creators of Making a Murderer left out of the show which goes against Steven Avery, such as the fact that there was additional DNA evidence pointing towards him, Halbach's belongings were found at Avery's home, Avery and Halbach knew each other, several members of his family admitting Avery was an abusive man, among many other things.
As gripping as it can be, it's not a massively reliable programme. The Confession Tapes and The Keepers were better IMO.
All of those things are addressed in the second series, though as the whole primes is that he was framed, they're largely irrelevant.
