as it was a comedy album put together by Jo Stafford and her husband, I believe the two right hands were just another joke they were having with their fans
Thanks for the background info jene (sorry, I can't put the little mark over the e). Do you know if her husband was really a Jonathan Edwards? ...just asking because I am too lazy to do the research.
OK this is weird, found another album of his on Amazon and it has two LEFT hands! http://www.amazon.com/Original-Piano-Artistry-Jonathan-Edwards/dp/B0008ENI52