Character mistake: In "The Drunken Clam", while Quagmire and Joe are playing table tennis, a poster on the wall incorrectly spells "Pawtucket Patriot ale" as "Pawtucket Patrtot ale."
Continuity mistake: When Meg's boss tells her to fire Peter, he has plungers on his nipples. He walks over to Meg and takes them off. A second later his shirt is tucked in without Peter being able to tuck it in. He's holding plungers in both hands.
Revealing mistake: Right after the "Ghost Whisperer" cutaway, while Peter, Chris, and Lois are sitting on the couch, Chris' eyes disappear for a single frame.
Continuity mistake: The gun in Peter's first cutaway vanishes when the stage goes dark.
Continuity mistake: One of the ping pong balls that fall off Peter vanishes when it hits the ground.
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