Connie D'Amico

The show: Family Guy
The episode: "Stew-Roids," first aired a couple of Sundays ago on FOX.
What happened: After breaking up with her boyfriend, Connie D'Amico realizes she has dated every jock in the school. So she decides to choose an unpopular guy for her next boyfriend, picking Chris Griffin. Suddenly Chris becomes very popular and even takes Connie home to dinner. Peter is aroused by Connie. In the subplot, Stewie is beat up by the newborn Swanson daughter, so he takes steroids and quickly bulks up.
Why it doesn't quite make sense: Connie D'Amico has had so much contact with the Griffin family that it's starting to strain credibility when she comes to Griffin house and acts as if she's meeting them for the first time. It's one thing for Peter to forget that he's had his chance with Connie, back when he went 'undercover' to James Woods High as "Lando Griffin." And you can even accept that Connie would have forgotten about Lando by now.
But doesn't she remember how Peter bashed her face into a glass case several times in the more recent episode "Peter's Daughter"? Maybe the beating affected her memory, but that seems like too much shoehorning to explain why Connie doesn't recognize Peter in any way. Why doesn't Connie remember what Brian said to her at the school dance in "Barely Legal"? What about Stewie? Stewie went out with Connie as "Zack Sawyer" in "McStroke" and found out the hard way that he's a baby, as the police led her away handcuffed. (And how exactly did she get out of that legal jam?) In this episode, Stewie is different from his normal appearance because of his steroid-induced muscles. But his head shape remains the same. In fact, the shape of his head is so distinctive in this show that it justifies a joke in the next episode, "We Love You, Conrad," in which Stewie appears on a TV show in silhouette to hide his identity, which is given away anyway by the shape of his head. Certainly Connie would wonder about Stewie's muscles, but shouldn't his head have triggered some sort of recall in her mind? In writing this episode, Chris was the only male member of the family with whom Connie could have a fresh storyline. But bringing her to the Griffins' home needlessly creates continuity problems.
However, this episode deserves some credit in the form of "continuity points" (as Phil Farrand calls them) when Peter asks Joe Swanson as to what happened to his son Kevin. Surely fans of the show wondered if Meg had simply given up on trying to get with Kevin or if he had gone somewhere. Joe simply says that Kevin died in Iraq.