Many actors and creative types from Sheldon Leonard related shows are in this episode, including director John Rich (Dick Van Dyke show), writers Norman Paul and Jack Elinson, and actors Hamilton Camp (Andy Griffith Show, Hey, Landlord) Jamie Farr (DVD, AGS) along with Leonard himself. And Barry Williams from The Brady Bunch.
Although Duke is in Hollywood with the platoon, he doesn't appear with the other extras in the movie shoot.
Throughout this four-part story arc, the actors playing the other marines in Gomer's platoon change in each episode.