I was watching Andy Griffith today and a couple of episodes had actors on it that were character actors from back in the day and in a LOT of TV (and probably a few movies too). Check out their IMdB pages for all the things they were in.
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Bartlett Robinson
https://www.google.com/search?q=Bart...ih=816#imgrc=_
https://www.imdb.com/name/nm0732397/?ref_=tt_cl_t6
Dabbs Greer
https://www.google.com/search?q=Dabb...ih=816#imgrc=_
https://www.imdb.com/name/nm0339428/?ref_=tt_cl_t6