I never noticed those grapes on the table. And it looks like they were one of the things that was always there 5 seasons. It wasn't until the HGTV Brady House Renovation went looking for them in 2019 that I became aware that they were even ever there.
They were also used, or similar ones, on Desilu's "The Joey Bishop Show" in 1962
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Paramount's "Here's Lucy" used 2 sets of them in 1968 on this set before they moved into Stage 5 and ended up in permanently in The Brady home in 1969. Lucy also used a single Brady Dining room chair