True. Background does count in these quizes. The Waltons episode was in the woods “in Virginia” while the Gunsmoke episode was in the desert. While I honestly thought the two episodes were fairly close together, IMDb tells me that they were actually 5yrs apart. 1969 for Gunsmoke & 1974 for the Waltons. Ron definitely had a baby-face for a while 😆

TOUGH Happy Days Question:
Chuck Cunningham (Gavan O'Herlihy and Randolph Roberts) disapeared from
Happy Days WITH NO explanation and CC had
Very Little Air Time on Happy Days but there was one character on Happy Days who had LESS AIR
TIME than Chuck Cunningham. Can anyone
Name the one character who had Less Air Time on Happy Days than basketball
Player Chuck Cunningham?
One Clue: The Answer is NOT Spike (Danny Butch) pr
Sticks(John Anthony Bailey)
Also Rpy Stuart played Corporal Boyle in
Gomer Pyle USMC.
Who did Roy Stuart REPLACE on Gomer Pyle USMC?
Russell Johnson played the
Professor on Gilligans Island but what was the
Professors first and last name on Gilligans Island?Who played the Professor
On the Gilligans Island.Pilot
Episode?
On The Dick Van Dyke episode Ghost Of A Chanz
Were the hotel clerk abs
The spooky guy bringing in
The wood.for the fireplace
IN ON Mel Cooleys Practical
Jokes?
On The Adventures Of
Superman did Clark Kent ever REVEAL to Lois Lane
Jimmy Olson and Perry White that he was Superman?

Gilligans Island Quiz:
https://www.metv.com/quiz/the-gigantic-gilligans-island-quiz
Gomer Pyle USMC Quiz:
https://www.metv.com/quiz/how-well-do-you-know-gomer-pyle-usmc
The Andy Griffith Show:
https://www.metv.com/quiz/can-you-answer-real-jeopardy-questions-that-are-exclusively-about-the-andy-griffith-show
Mayberry RFD Quiz:
https://www.metv.com/quiz/can-you-tell-if-these-images-of-buddy-foster-are-from-mayberry-rfd-or-something-else
The Three Stooges Quiz:
https://www.metv.com/quiz/it-takes-a-real-wise-guy-to-pass-this-quiz-on-the-three-stooges

Your question should be what character(s) had less air time than Randolph Roberts who appeared in (2) episodes compared to Gavan O'Herlihy's (9) episodes.
Also there were multiple characters that only appeared in one episode, So there is more than one character.
Roy Stuart replaced Ronnie Schell on Gomer Pyle USMC.
The Professors first and last name on Gilligans Island was Professor Roy Hinkley or Dr. Roy Hinkley.
John Gabriel played the professor on the pilot episode.
What do you mean?
On The Dick Van Dyke episode Ghost Of A Chanz
Were the hotel clerk abs (what does that mean?
Clark Kent revealed his identity directly and indirectly to Lois, Jimmy and Perry over the span of the original series.

No it's Vicky Shreck she played:
Bridgette 'Muffin' Maloney in the The Big Brother (1976) episode of the Walton's, she was a young con artist in the episode.
She also appeared on 1 episode of The Brady Bunch, and 26 episodes of How the West Was Won and a few other shows and TV movies.