Petergeist - S4-E26
Continuity mistake: The table with the TV on in Peter and Lois' room is just a small table at the beginning of the episode when Stewie talks to the poltergeist. But as they speak to Stewie in the TV it's on a high up chest of drawers. (00:08:00 - 00:12:00)
Petergeist - S4-E26
Other mistake: The Griffins' house disappears when they flee, but when they go to Quagmire's house after, you can see their house when they are at the front door. Quagmire's house is on the right of theirs and the angle of the shot is to the left so it's definitely their house, not Quagmire's other neighbours on his right. (00:16:36)
Petergeist - S4-E26
Continuity mistake: Lois slaps the skull out of Peter's hand and it lands on top of the dirt pile. They both turn around to look at the house and the skull is nowhere in sight.
Petergeist - S4-E26
Continuity mistake: The filing cabinet that was beside the TV moves to the corner beside the desk.
Petergeist - S4-E26
Continuity mistake: When the spirits first come out of the TV, notice the wall beside the TV. There's nothing there. Brian says who's here? Next shot shows a filing cabinet with a pink blanket on top.
Chosen answer: It's a real song called "Elvira". Originally by Dallas Fraizer in '66, however, this version seems to be the Oak Ridge Boys cover version. However, the mega lesbians skip the verse and just sing the chorus after the opening line.
Bishop73