I don't think I knew that, but if I did I had forgotten. As I said above, I do know I saw the first performance. Every once in a while, I guess even I get lucky. :-)
For what it's worth, Joanne Woodward gave about as terrific a performance as possible with minimal rehearsal time and carrying her script. It was not in any way a "reading." She gave it her all. I was both very pleased to see her (it would be the only time I'd get to see her onstage) and so glad to get to see Heckart do the role later in New York.