The Ziff Who Came to Dinner - S15-E14
Continuity mistake: When the Simpsons first see Artie Ziff in the attic, as he stands up, there's a theremin behind him (corresponding with Homer's comment that the "ghost" was playing his theremin). Artie puts a sign up above it. However, when Artie moves to the rafters, the sign he put up is still there, but the theremin isn't.
Chosen answer: Actually it looks like many are large characters but I guess it's a quick way to show as many of the characters as possible. If you freeze frame the shots you can see the characters Milhouse, Nelson, Jimbo, Patty and Selma, Grampa Simpson, Dr Hibbert, Flanders and his wife and many more.
Lummie ★