The word on Evening Primrose has always been that the Collier estate sold the rights to the story (on which its based) for one broadcast and one broadcast only. No amount of coaxing has been able to convince them to let it be seen again.
I've seen it, and my favorite number in it was ruined by the shoddy direction of one Stephen Sondheim. Before you throw something at your computer screen, I hasten to tell you that Stephen Sondheim believes the song was ruined by his shoddy direction. It's the first solo, for Anthony Perkins, and it's called If You Can Find Me I'm Here. Sondheim had long been a film buff, had worked on some TV shows before, and begged to be given a chance to direct something. So, the director of Evening Primrose, against his better judgment, let Sondheim do just this song. Sondheim instructed his old friend Anthony Perkins to look around the camera, but not directly at it. As a result, Perkins looks unfocussed and oddly irresolute, which is at odds with the wonderful song would-be director Sondheim had written.
I think it was on a radio interview with Paul Lazarus, around the time of Sondheim's 50th birthday, that he made this confession.