At the beginning of the show when she takes questions from the audience, Elizabeth Montgomery (Bewitched) and Ken Berry (Mayberry R.F.D.) are audience members.
When Carol Burnett briefly chats with Elizabeth Montgomery, who's in the audience, they mention a film they'd done together. Ms. Montgomery shares the joke that the film was shown on a flight that she and her husband were on, and there were 17 walkouts, indicating that the film was not very enjoyable, or popular. In syndication/streaming edits of this episode, the name of the film might be edited out; it was called, "Who's Been Sleeping In My Bed," from 1963.
Ken Berry is one of Carol's friends shown to be in the audience. Mr. Berry went on to be a regular cast member of "Mama's Family" (1983-1990), which got its start on The Carol Burnett Show (1967-1978).