I remember the peanut butter one also. We see a farmer pulling a few out of the ground, while there's harpsichord music in the background. A kid's voiceover does mention "The raw peanuts are horrible, my grandpa bought some". Then they go to the factory see the peanuts being pulled out of the shells (Kid voiceover: And now they'll get all ground up!)
Then some faster music plays, as the peanuts get shaken along a conveyor belt to remove any impurities, then they are heated and ground up.
Then we see a shot of the peanut butter in a vat being mixed, and reaching a creamy consistency. (Kid voiceover: PEANUT BUTTER!!!)
Next we see the peanut butter getting pumped into jars, lids screwed on and labels attached, and you're right. Here's where the calliope music in waltz time is played.
In the end, we see the finished jars, waiting to be sent out to a store near you, and you can hear the kids "doo, bee doo, bee doo bee doo". Frank Sinatra would've been proud!