I found this script at a used bookstore when I was in Salt Lake City in 2011. It's actually a rather fascinating read - just seeing what the participants on this variety show held in their hands. This particular episode has as its guest stars Dirk Benedict, Debbie Boone and Paul Lynde. It was the final episode before the show morphed into the mid-season replacement The Osmond Family Show (which didn't last long).
Let's have a look at a few pages, shall we?
The cover states that it was taped on December 8, 1978 with the air date of February 2, 1979. However, according to the Osmond official site, this episode actually aired on January 19, 1979.
(As always, click on them to view full size)
As everyone knows, Paul Lynde was a staple on variety and game shows. Dirk Benedict was on Battlestar Galactica as Lt. Starbuck - the show's final episode aired about eight months prior to this Donny & Marie episode. The A-Team didn't start until 1983.
What follows is the rehearsal and taping schedule.
Note: I'm actually selling this item on ebay. Grab it before it's gone!