DA DA DA DUH DA!
Do you mean the "Love, American Style" jingle at the end of every segment? They used it in The Simpsons during Treehouse of Horror III twice, and also once the episode "The Front" where Grandpa Simpson dreams he's a woman and says, "You could BOTH marry me!"

I thought the soul line was good but delivered poorly. It could have been a good line if it was delivered jokingly instead of whimsically, making it ironic for present-day Walter. However Walter's reaction to the soul line, about there only being chemistry, and then showing him sitting in his car all guilt-ridden…