Was the episode about the actress Alvira Drummond based on a real story from John Boy's past and if so who was the actress that stopped by Walton's Mountain in real life?

Oh honey, let me tell you the tea. The episode about Alvira Drummond was indeed inspired by a real-life encounter from John Boy's past. The actress who stopped by Walton's Mountain in real life was none other than the fabulous Tallulah Bankhead. Can you imagine the drama that must have ensued?