Far from a blunder, indeed. Overall, the episode felt very solid, and it didn't feel short and disjointed in the least. The best jokes were in the first act, I thought, from the reappearance of Cookie Kwan, to some good Milhouse lines. The second act had the least laughs, which was its biggest problem (I didn't laugh much at all really), but the story developped nicely. The third act was pretty fast-paced and entertaining, with another character return (Stampy, with his trademark people-eating), and some decent jokes. The infamous flash scene worked fine by me, because Marge will always do anything for her family's safety. The very last line I didn't really get (the fried chicken bit), and the Baha Men thing was slightly lame, but it referenced a earlier joke in the episode (which worked), so all's well that ends well. The main cons about the episode were a couple wacky/odd bits, like Marge's smile implant, and another Lenny and Carl possibly gay reference. The song was decent, but Bart capping off the scene trying to make a song didn't work, IMO.
Overall, a very solid unrushed episode, with a subplot that tied together with the main plot. Good stuff. 4/5
One thing, there were a bunch of things in commercials for the episode that didn't wind up in the ep itself, like Marge covering her implants with pots from Bart, and at the restaurant, there was something in the commercial that showed Hibbert looking right down into her shirt. Also, there was a line where Bart yells "Great mother of Bart!" in a commercial.
Not watching King of the Hill, since the "new" episode actually aired over a year ago on Global. Not such a great ep.