Mons Kjellin shares surname with director
Alf Kjellin who directed both the Bonanza episode:
The Hidden Enemy (1972) and the Waltons episode:
The Choice (1975).
In the Bonanza episode, Mons Kjellin plays the role of Chris Wills. In the Waltons episode
Mans Kjellin plays the role of "Boy".
It is unclear if Mons and Mans Kjellin is the same actor who may actually have the Swedish name Måns Kjellin.
Måns is a common Swedish name. "Mons" is the Norwegian form of Måns.