The dates on Grandpa Zebulon Walton's headstone read 1865-1941.
Peggy Rea, who is cast as Mrs. Borer, the landlord who rents an apartment to Mary Ellen and Erin, would return to The Waltons for seasons 8 & 9 as regular cast member Rose Burton, Olivia Waltons' cousin.
Will Geer (1902-1978) was 76 when he died, as was his character Zebulon Walton (1865-1941).
Originally aired on CBS in a two-hour time slot, the syndicated version is split in two, one-hour segments.
The memory sequence that Grandma was thinking about Grandpa was from this season 2 episode 17 called the Heritage.