There is a reference to stolen Silly Putty, and kid that was sorry for taking it; between Carl and Mikes replacement. This is reference to the Two and a Half Men, Season 2 Episode 6 "The Price of Healthy Gums is Eternal Vigilance. Two and a Half Men is another sitcom created by Chuck Lorre. In that episode Charlie had stolen the Silly Putty and put it in his brother Alan's pocket. That way if anyone got caught it wouldn't be him.