Blood Feud - S2-E22
[Homer goes to the post office to get a letter he accidentally sent to Mr Burns.]
Homer: [In an obviously fake voice.] Hello, my name is Mr Burns. I believe you have a letter for me.
Post Office Clerk: OK, Mr Burns, what's your first name?
Homer: I don't know.
Continuity mistake: When Homer's Vegas wife shows him the video in front of Marge, it shows Homer kissing Ned. This didn't happen when she showed it in the Vegas episode.
Trivia: The Simpsons holds the record for most guest stars; it is also the only non-variety show to have had appearances from three former Beatles (Paul, George and Ringo).
Question: Which episodes feature the "Howling Dog" (usually used on outside shots of buildings)?