All great foods! One way I have of making the pea salad: frozen peas (no need to thaw), ranch salad dressing, diced garlic, shredded cheddar cheese,. salted red skin peanuts. Just mix all together and let sit, stirring occasionally until peas are thawed. All done!
I dunno, I lived thru the 70s and I went on a lot of picnics, but most of the Narrator's food descriptions I never heard of being put together for a picnic. I'm from the Washinton States and our picnic fare was normally Fried Chicken and Potato Salad & maybe a lettuce salad. Also, hotdogs roasted over an open fire, also Marshmellows toasted over the fire.