Tree House of Horror VII - S8-E1
Continuity mistake: In "The Genesis Tub", when Lisa takes the bowl of cola to the microscope on her dressing room table, you can see a brush near the edge of the table, but in the next shot the brush is behind the microscope.
Tree House of Horror VII - S8-E1
Continuity mistake: In "The Genesis Tub", when Bart comes into Lisa's bedroom with a balloon behind his ear, he goes to see Lisa. In the next shot, Bart is much near the door, and in the shot after that, he is near Lisa again.
Tree House of Horror VII - S8-E1
Continuity mistake: In "The Thing and I", when Homer puts a blanket on the floor for Hugo to rest his head on, you can see Homer is standing by Hugo. In the next shot, Homer is standing by the blanket.
Tree House of Horror VII - S8-E1
Continuity mistake: In "The Thing and I", when Hugo ties up Bart on the table in the attic, you can see that Bart's feet are tied up by pieces of rope. But when Dr Hibbert walks towards Hugo holding a picture frame, the rope is nowhere to be seen.
Tree House of Horror VII - S8-E1
Continuity mistake: In "The Thing and I", when the family are speaking to Dr Hibbert, there is a picture of Bart as a baby on the wall behind them. Later on in the scene, it disappears, and when Bart is by the staircase, it is back again.
Tree House of Horror VII - S8-E1
Continuity mistake: In "The Thing and I", when Homer and Marge return home in the pouring rain, Homer puts his hat on the hat stand. But when Bart is speaking to his mother, look at the hat stand and you can see the hat has gone.
Tree House of Horror VII - S8-E1
Continuity mistake: In "The Thing and I", when Bart is speaking to his mother after she has put down the phone, you can see Bart's arms are crossed, but when viewed from behind in the next shot, he now has his arms by his side.
Tree House of Horror VII - S8-E1
Continuity mistake: In "The Thing and I", when Bart, Lisa and Maggie are in the attic, Bart picks up a book and on The Front cover it shows a picture of Homer with the words "Homer, I Hardly Knew Me" by Homer Simpson. But when we see Bart with the book in the next shot, The Front cover is now completely clear.
Tree House of Horror VII - S8-E1
Continuity mistake: In "The Thing and I", when Lisa and Bart watch their father go to the fridge, you can see the spoons in their bowls are pointing to the left, but after a quick cut to Homer getting the fish out of the fridge, we cut back to Bart and Lisa and the spoons are now pointing to the right.
Tree House of Horror VII - S8-E1
Continuity mistake: In "The Thing and I", when the family are having their breakfast, you can there is a cup next to Marge's bowl, but when Homer gets up from his chair to go to the fridge, the cup is now near the edge of the table.
Tree House of Horror VII - S8-E1
Continuity mistake: In "The Thing and I", when Bart and Lisa come out of their bedrooms at the beginning, their doors are only partially open but in the next shot they are now fully open.
Answer: Willy referred to an encounter he believed he had with actual aliens, while Wiggum thought he was referring to the arcade game.