I have not seen him refer to notes even once, if he has, I haven't seen it.
He is obviously highly intelligent. He knows his stuff. Never once a hesitation to refer back in his mind. It's all right there. Unbelievable.
These Senators understand the basics. That someone that pledges to a belief and infallible practice of stare decisis is unlikely to overturn roe. They come into the hearing with this rudimentary knowledge, but they fail to understand the scope of intellectual thoughts on the topic. Easily Roberts trumps them since he didn't study a Cliff Notes version of stare decisis, but actually read the "book".
His memory is clearly either very developed or shades of photographic.