Has a wine store named after him in West Los Angeles, California.
He and Jack Webb were best friends from 1949 to Thursday, December 23rd, 1982, when Jack Webb lost his life.
He and future co-star Mike Farrell were both fans of the "M*A*S*H" (1972) series, in the early years, before they both joined the cast in 1975.
He replaced McLean Stevenson in the role of Colonel Sherman Potter on "M*A*S*H" (1972), for the series' fourth season, primarily because of his long association with Gene Reynolds.
He was an active opponent of the anti-communist witch hunts in Hollywood.
His "M*A*S*H" (1972) character was a heavy drinker and a smoker, as was Morgan, in real-life.
His favorite actor was Alan Alda, who grew up watching him before he co-starred with Morgan on "M*A*S*H" (1972).
His parents were Henry Bratsberg, a mechanic born in Norway, and Anna Olsen, a housewife born in Sweden.
In 1942, Morgan had a small part in Orchestra Wives (1942) featuring Glenn Miller. In 1953, co-starred in The Glenn Miller Story (1954).
In several episodes of "M*A*S*H" (1972), Col. Potter was seen painting portraits, mainly of the other characters. These portraits were actually painted by Morgan.
In the episode "Murder, She Wrote: The Days Dwindle Down (#3.21)" (1987), he played an LAPD Detective named Webb. In 1967, he had starred as a member of the LAPD in "Dragnet 1967" (1967) which was created by and costarred Jack Webb.
In various episodes of "M*A*S*H" (1972), his real-life wife, Eileen Detchon, stood in for his character's wife, Mildred's portrait on his character's desk.
Of Norwegian descent, his grandparents were immigrants from Scandinavia.
Once belonged to the Group Theater in New York.
Once said that he enjoyed playing Colonel Potter on "M*A*S*H" (1972) so much that he felt that he could have "gone on forever" playing that character.
One of his sons was the friend of one of James Arness's children. One of Morgan's sons spent the night at Arness' ranch.
Played Off. Bill Gannon, four times on: "Dragnet" (1951), "Dragnet 1967" (1967), Dragnet (1987) and "The Simpsons" (1989).
Prior to joining the cast of "M*A*S*H" (1972) in the fourth season as the stern but decent Colonel Potter, he appeared in the third season episode "M*A*S*H: The General Flipped at Dawn (#3.1)" (1974) as a crazed general who wanted to move the 4077 unit closer to the front line.
Remained friends with Mike Farrell, Loretta Swit, amongst the rest of the "M*A*S*H" (1972) cast, during and after the series' cancellation.
Reprised his "Dragnet 1967" (1967), Dragnet 1966 (1969) (TV) and Dragnet (1987) character (Officer Bill Gannon) in "The Simpsons" (1989) episode "Mother Simpson".