Can anyone explain this joke from the Roast of Bob Saget?

Question

The Henry Fonda picking blueberries joke

Answer 1

Watch the movie On Golden Pond

There is a scene in the movie where Fonda is arguing with Hepburn about picking blueberries and strawberries.

Answer 2

Weird.  It must be because Henry Fonda is dead and in one of his movies he was picking blueberries.  Must have been a popular movie.  But I guess the joke is that HF picking berries is better than Bob Saget.  

Some jokes have hidden meanings.

Answer 3

I didn't understand that either!!!!!!

Maybe because he's dead...?

Edit: Maybe the a$$holes who gave me and Marvin a thumbs down can enlighten us! *rolls eyes*