Continuity mistake: At the start, Chris' hat is all yellow instead of yellow and black. (00:00:30)
Continuity mistake: When Peter is playing with Stewie's nose, Stewie's arms are by his side, but when the shot changes, he's got his arms in front of him. (00:08:10)
Continuity mistake: When Peter says about suing Dr. Hartman, Lois is holding Stewie who is asleep and facing Peter. When the shot changes, Stewie is now looking towards Brian. (00:08:20)
Continuity mistake: When Stewie keeps saying "mum", he's not stood next to a rug. When the shot changes, a blue rug has appeared next to Stewie. (00:11:40)
Continuity mistake: When Lois is carrying Stewie down the stairs, the brick patterns in the wall change between the wide shot and the close-ups. (00:14:10)
Continuity mistake: When Lois is talking to Brian about having homicidal thoughts, the rug colours swap order. (00:14:20)
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