Question about Ken Mattingly watching Dick Cavett segment...

I'm surprise that when I search "Dick Cavett Apollo 13" on youtube, that there hasn't been anybody who has uploaded the real episode. Does anybody know the season and episode that monologue appeared in? Crew came home April 17. 1970. Closest episode in terms of date was April 6, 1970, which was season 4 episode 69. But he could have said those jokes in any other episodes leading up to the launch. Just curious...