Read the timings on post 24 in this thread:
http://www.hometheaterforum.com/community/threads/and-just-spotted-a-new-carol-burnett-classic-collection-on-amazon-as-well-details-below.348741/page-2
One of the things that I have really enjoyed (and had forgotten) is just how well Carol and Nanette Fabray worked together. The "Southern Belles" sketch from 10/12/70 was hysterical.
If you go back to the original TV Guide listing for the show of 10/13/71, it lists that Carol and Cass Elliot did a "Love Songs medley. Likely there was a clearance problem with one or more songs and they chopped out the entire thing. Ken Berry is listed as performing the solo number...