Repeating items that i probably already mentioned up above shows my age!
Jiffy popcorn was a thing with the foil pan that would expand - it was just such fun when you were a little kid.
The Ice Cream Truck like Good Humor ringing the bell and everyone including your grandparents would run around trying to find change and giving their order for their most favorite item.
I remember the trucks that were actual rides (like the giant rocker) that would come down the block in Brooklyn. Anyone remember those?
I remember when I learned that the Milkman could deliver chocolate milk - that was a major revelation. And wondering why we never ordered it? Chocolate Milk delivered?
Bosco Chocolate Syrup I guess that was in the Northeast - not sure if it is around anymore.