Forgot to mention that Irene Hamalain did the hair on DS until sometime in 1970, and she did sometimes get a mention in the credits. There are some funny pictures of her in the various PomPress books. Darling Marie Wallace charitably described Irene as a rather "fussy" woman.
I'm blocking on the name of the gracious lady who took over after Irene left, but she came to one of Jonathan's readings in Long Island, and reminded him of that "Madison Avenue haircut" she used to give him, netting a big smile from him in response. I think there is a photo of her on the Dee Kearney's pages in Mr. Juggins' DS FAQ site.
Gothick