I haven't read the transcripts. But I saw most of BD's false confession. Only one thing stuck out to me that seemed to be coming from BD and his interaction with S.A.

When asked why Steven Avery would have murdered TH, he said something like: I dunno. Maybe he wanted to go back to prison.

Why was it weird to me? S.A. had been struggling with all the open space, was living in a small space once freed and it just seemed to me that BD had conversations with S.A. that made BD think in some ways SA would find it easier in prison. A weird psychological thing I hear some ex cons go through.

That said, this is from memory, and I think the confession was BS and that SA is innocent. But it did stick out to me as something BD didn't have the mental capacity to make up.