Continuity mistake: When the green car is hit by the train in the chicken fight, the driver vanishes from the car instantly. (00:04:30)
Continuity mistake: At the start we can see Quagmire and Mort sat at the bowling lane and Peter is nowhere to be seen. When the shot changes, Peter is now stood ready to bowl. (00:00:35)
Continuity mistake: At the bowling alley just as Mort is about to bowl a perfect game, the bowling ball in Joe's lap and the beer in his hand disappear. (00:01:45)
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