I didn't see the entire 30 Rock piece but I think I saw all of the Sandusky interview as re-aired on espn. Definitely doesn't seem like sound legal advice and possibly since the lawyer was with Costas in person it was an effort by the lawyer to gain personal fame.
He is the only major player in this to speak publicly, so by doing this quickly he somehow helps himself more than Paterno or McQueary have to date. I think he's guilty and possibly delusional, but that's conjecture. I think he didn't really do anything towards proving innocence other than getting his voice out there saying I am not guilty. I think it helps the entire situation somehow to have him out there as a real face to this and not some imagined super villain. But mostly what that interview does is folks can see via his interview how sexual predators fool those around them.
Regarding the interview itself I think confessing to the showers and the hands on the legs seems both an admission of guilt and delusional. There is no reason for a coach to shower with any athlete and it gets exponentially less appropriate as ages diverge. This is obvious. If he was showering with young girls for our societal norms that would clearly be grossly impermissible, how can he not see that this is only a tad bit different? Is he using the same defenses he successfully used in 1998 and 2002? Since it fooled some pretty smart people before its a learned behavior for him. He is likely a liar caught and is attempting to mitigate his punishment by admitting some guilt and remorse.
Then definitely the pause and roundabout answer regarding the question on finding young boys sexually attracted was indicative of some aberrant thinking and behavior. First you say NO strongly. Maybe if pushed you add something about being married and heterosexual. But to respond by talking about how much you love young people, going on and on, quite possibly was a window into how his psychosis works and how he convinces himself that his depraved behavior is a justifiably expression in his warped deviant mind.
Costas asked some direct and pointed questions, but I felt that the interview should have been conducted by either a prosecuting lawyer or a psychiatrist. I think a psychiatrist would have called him on the telling pauses and pushed him on his clearly warped actions or thoughts and ultimately worked towards a full confession.