Continuity mistake: When Brian stops at the Marriott, he orders a Jack on the rocks. As he is ordering it, there is a woman in the background with a martini, then when the camera cuts to behind the counter when Brian receives the Jack on the rocks, the same woman has red wine instead of a martini.

Family Guy (1999)
1 continuity mistake in Quagmire's Dad
Starring: Mila Kunis, Seth Green, Seth MacFarlane, Lacey Chabert, Alex Borstein

And Then There Were Fewer - S9-E1
Continuity mistake: When everyone is in the dining room at the dinner table, the order of where everyone sits changes between shots. In all moments where it shows everyone sitting, the order is Priscilla, Derek, Jillian, Mort, Muriel, and Carl. But in one shot, the order is Priscilla, Derek, Jillian, Muriel, Mort, Carl.
When You Wish Upon a Weinstein - S3-E22
Peter Griffin: You better watch who you're calling a child Lois. Because if I'm a child then you know what that makes you? A paedophile, and I'll be damned if I'm gonna stand here and be lectured by a pervert.
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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