Continuity mistake: At the start, while Peter and the kids are watching TV, the buttons on Peter's shirt are on his left side, but in Peter's closeup the buttons switch to his right side, where they usually are. The switching happens again in following shots.
Continuity mistake: While Lois is in the Paris hotel suite packing her suitcase there are two doors behind her, and Bonnie opens one of those doors. The other door has its door knob on the left side of the door, but when Lois walks over and opens that other door to reveal Joe, its door knob is now at the right side of the door. (00:18:00)
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