The Dick Van Dyke show basement

After reading around the web, I noticed there were many comments about the rock in the basement.  I saw an episode where Buddy's brother came to town.  He was a hustler and played pool with Rob.  Well I was baffled when I found out Rob had a pool table, and guess what it was in the basement. Rob stated in one episode that he couldn't fit a full size pool table in the basement because of the rock!  But I remember the episode of the rock in the basement of one of the houses when Rob bought both houses in Your Home Sweet Home Is My Home.