The first person being interviewed (an Englishman) seems like a really cool guy but so far, they haven't said who he is and I don't recognize him. He's the one who starts out talking about how difficult it is to race in the rain.
Richard Williams is great in the additional interview footage on the DVD extras, really knows what he's talking about - true passion and intelligence talking about Senna and why he was so unique. Really appreciated his explanation of oversteer and understeer to a layman like me too! I loved his evocative description of the day of Senna's funeral in Sao Paulo and was inspired to read his book 'The Death of Ayrton Senna', which is a pretty good reflective biography and a fascinating read charting his rise through karting and how he became champion. I recommend it if you are hungry for more info!