This was one of the first scenes I storyboarded and I remember Justin Roiland being impressed by the fact that I bothered to research on how surgery was performed on horses (i.e. the legs held up in stirrups).
That's Alison Brie, right? The voice of Planetina doing Beth's voice? I can hear it better in the last part, but that's definitely not Sarah Chalke doing Beth's voice. It's interesting to think that Sarah could have, at one point, not been the to voice Beth. I can't imagine Beth with any other voice, it's perfect.