Hepburn rarely granted interviews, and when she did, she wanted them under her terms. When she agreed to appear on the Dick Cavett Show they went in the studio a day early so she could get the feel of things. They ended up doing the interview right then and there, without an audience.
In this clip she tells Cavett and his crew what she thinks of the set.
This was recorded on September 14, 1973 and appears as an extra on this Dick Cavett Show DVD: http://www.amazon.com/Dick-Cavett-Sho...
Cavett talks a bit about this moment in this 2011 interview: http://www.maximumfun.org/sound-young... and this one from 2014: http://www.bravotv.com/watch-what-hap...
More clips featuring Dick Cavett’s sets: • Dick Cavett Sets