Continuity mistake: When Peggy is insulting Bill to try and get him to sell Metalife products again, he has a beer in his left hand. In the next shot when he tries to convince Peggy to give him another chance the beer has disappeared even though he never put the beer down. They were outside on the front lawn so there was not enough time for him to hide it or place it somewhere else on his front lawn.
Continuity mistake: As Peggy & Bill are checking into the hotel, there is a wide shot of the lobby and Peggy is wearing a sleeveless shirt. In the next shot that is a close up and she is wearing a pink full sleeve shirt.
Continuity mistake: When Peggy tries to sell Dale the Metalife products she is just passing the fence (at the bottom of her driveway). In the following shot we her cart is in the middle of the road. The change of shots there was not enough time for her to have made that distance from the end of the driveway to the middle of the road.
Continuity mistake: Bill picks up the case of Metalife products to put them in his car. After discovering he has a blister he picks up the box and the logo on the box is facing the left-hand side. The next shot it's changed to the front of the box. The change of shots was instant so there was no chance he could have turned the box around.
Answer: If you are talking about the "Thou shalt not do this, thou shalt not do that" song, I'm not sure if a song like that actually exists. Green Day, the guest voices on the episode, might have just been improvising to keep their appearance from being too obvious.