When the film reaches its courtroom finale, I noticed Liam Dunn as the hypochondriac judge and Graham Jarvis as his bailiff. Donna recognized the bailiff but couldn't place him, so I explained that Graham Jarvis had been featured in one of her favorite shows of the 1970s -- MARY HARTMAN, MARY HARTMAN -- as Charlie Haggers, doting stage husband of would-be country-western star Loretta Haggers, who was played by then-newcomer Mary Kay Place.
As soon as my mouth invoked her name, I was startled to see a young, still-undiscovered Mary Kay Place walking onscreen to deposit two of the film's plaid carrying cases on the judge's bench!
The IMDb has no record of Mary Kay's presence in the film, as they do with John Byner's uncredited appearance, but there she is, right up front, plain as day. The IMDb lists a 1973 episode of ALL IN THE FAMILY, like MARY HARTMAN a Norman Lear production, as her first onscreen acting appearance.
Graham Jarvis passed away in 2003, but Mary Kay Place continues to make welcome appearances in film and television, currently holding down a primary supporting role in HBO'S BIG LOVE. I've got to wonder if she and Graham had the same agent or something, or if they were even conscious of having worked together in this earlier project when they were subsequently cast as "baby boy" and wife.
Anyway, a discovery worth sharing with the rest of the world.