An extensive part of the David Frost interview (in the video library) with Jack Benny concerns Jack's thoughts on why, at the time, he had never published his memoirs. One of the great things about hearing the 'real' Jack in such a long format interview is you get a sense of how detail-oriented he was; in the course of 90 minutes they really cover very few topics, but what they do cover is thorough.
So Jack explains about his autobiography - and he talks about first working with a 'ghost writer' or an '...as told to' type book. Apparently that got to the manuscript stage, and Jack rejected it because it 'didn't sound like him' or didn't like it for other reasons.
He then goes on to explain that he figured the honest thing to do was to sit down and write the thing himself, and he did. When it was done, he showed it to Mary, Irving Fein, George Burns, Fred DeCordova and a few other close associates who he advised him that it just wasn't up to snuff, and he also shelved that project.
One of these manuscripts ended up forming a good chunk of Joan Benny's "Sunday Nights at Seven". But which was it? The earlier work with the ghost writer, or Jack's solo effort?
Now, I have no basis other than stylistic criteria to gauge this, but my impression of the "Jack" sections of SNAS are that they are pretty slick and seem more in the same 'tone' as most Hollywood 'as told to' works, there isn't evidence, to me, anyway, of the mediocre writing that turned off Jack's close friends and associates, so my educated guess is that SNAS includes the first version of the Benny autobiography with the collaborator.
So does the second version (whichever one it is) still exist? Did portions of the Jack solo draft get reworked in the Mary-Hickey-Marcia Borie book?
It would be interesting to get the original versions of these published someday. I really love Sunday Nights at Seven - but it does seem that if you subtract the Joan sections, the Jack portion has to be cut down from a longer manuscript - it would have been an awfully short book.
Many mysteries to consider!
As a side note, in the interview Jack says that he thought Joan might someday write a good book about him - but at the time he wanted Shana Alexander to do his biography. Interesting choice!