The title is German and is, apparently intentionally, grammatically wrong. The correct phrase would be: "Burns verkauft das Kraftwerk" (or in English "Burns sells the power plant").
In the Land of Chocolate sequence there was supposed to be a road sign that read "Hershey Highway" (Hershey's is a chocolate manufacturer, but the term "hershey highway" refers to anal sex). However, the censors objected and the writers replaced it with "Fudgetown".
By coincidence, Phil Hartman happened to know a little German so he helped out with the conversations.
Originally, the writers decided to have Burns sell the plant to the Japanese, but they decided that it would have been too clichéd; the plot, however, remained the same with the Germans
The photo Burns gives Smithers of him and Elvis resembles the famous photo taken at the meeting between Elvis Presley and Richard Nixon.