I actually remember watching this show, mainly because RM would appear on it. What I most vividly remember is once when the topic was cats, and RM went on about how much he loved them. And Mary Tyler Moore's answer was that she hated them. Although later in her life, I think she got into animal welfare causes.
I know I remember reading that at one point Ross had two Siamese cats and that they were subjects for his photography. For the life of me, I can't find that mention.