I don't have a problem with the cutaways on Family Guy. Many of them are stretched out to eat up time when there isn't much of a plot. I don't even mind the ones that are completely unconnected to the episode's story. But my feeling is that, irrelevant or not, there should at least be a joke. Some of FG's cutaways are just the writers waxing nostalgic over some old commercial or TV show. The gag with Peter playing the word game with another guy from The Electric Company was funny (IMO) because there was a joke (Peter couldn't keep up with the momentum and when the other guy spelled "fat", Peter thought the guy was insulting him and he attacked him), but the gag in a later episode where a news report spontaneously breaks into a reenactment of the opening title sequence for The Electric Company was not funny because there was no joke beyond the novelty of "Remember this?"
And I have to say that I too was not impressed by the scene where Stewie dances with Gene Kelly. Aside from having no bearing on the plot whatsoever, all the writers did was show the famous scene from the movie Anchors Aweigh and cut-and-pasted Stewie over Jerry Mouse. The FG team gets no points for originality or for creativity; all they did was show a scene that someone else made famous and stuck one of their own characters in it. Stewie didn't do anything different, he just did everything that Jerry did. how was this in any way creative or funny?