Once upon a time, the Museum of Television & Radio had a blog. A couch potato by the name of "Home Fry" posted this interesting observation about "A Little Random Strangeness":
The Bizarre Case of The Two Jerrys
The Dick Van Dyke Show and The Bob Newhart Show: the protagonist of each show had a best friend named Jerry. They were both tall, dark haired, wisecracking dentists.
Comedy writer Rob Petrie's Jerry was an amateur psychologist, while psychologist Bob Hartley's Jerry fancied himself a comedian.
The actors who played the two Jerrys--Jerry Paris and Peter Bonerz--went on to become prolific television directors.
Reminds me of that old saw about the similarities between Lincoln and Kennedy....