I would also like to see the original broadcast on Goodyear Playhouse in 1958. Does anyone know who was in it?
I did a quick Google search and came up with:
Caroline - Hope Emerson
Elizabeth - Frances Sternhagen
Jeb - Jay C. Flippen
Larry - Peter Mark Richman
Walt -Ford Rainey
Martha - Paula Trueman
(I wonder if the Walt character is comparable to the Shadows on the Wall bible's Walt Cummings, who would later become Jason McGuire? If so, then I suppose Caroline did indeed believe she'd killed her husband.)
Perhaps someone involved in the festival could see if the script is available
Considering some of the DS actors will be performing it at the Fest, the script must be available somewhere for them to have gotten a copy of it. (Well, unless someone transcribed it from the kinescope of the original broadcast. The kinescope was supposed to be shown at a few different Fests, but it always got bumped.

)
Also, was there a Victoria Winters/governess of unknown origins character in "The House"?
I don't think so. I seem to recall something about the only people Caroline sees are her piano students. And in light of that, it's Interesting how we see Liz playing the piano in episode #2.
Vicki would seem to be the part DC's dream brought to the mix...