The episode may originally have been intended as a sequel to an episode that was written but unproduced. Hugh Wilson conceived, and assigned Steve Marshall to write, an episode called "Jennifer's Wedding" where Jennifer would marry one of her elderly boyfriends. The idea was to have her married for a few weeks and then kill the husband off. CBS didn't like the wedding story and it was never shot, but "Jennifer and the Will" could easily have been about the death of Jennifer's husband, and probably was supposed to be.
The elderly man who names Jennifer his executrix is played by the veteran Pat O'Brien, who actually knew Loni Anderson from way back; he did a summer stock play in Minneapolis and she had a small part. O'Brien, who basically never stopped working, had just done what would become his last film (Ragtime) and this was his next-to-last television appearance before his death in 1983 (he did a Happy Days in 1982).
For those keeping track of such things, I think this is like the third or fourth WKRP in Cincinnati episode with a joke about the Hare Krishnas. Hugh Wilson must have had a fondness for that joke (along with Jerry Vale jokes and the phrase "that's hardball, not slow pitch").
Cold Opening and Act 1