Yeah, I think with the way the format is now laid out (the four segments as opposed to three), it gets harder to have a stand alone subplot and have it work.
Some standout moments:
In the opening, the billboard with a picture of Bart and the worRAB, "please abduct this child, call Homer," and another good couch gag, this time with Nelson.
Moe's voice over reaction to Marge in a towel.
The cameo with Don Pardo.
Moe's watermark ("What are you lookin' at?)
Homer's text to Marge.
Milhouse's "you were my favorite Uncle, Uncle Otto."
"Dear God, this day gets more and more disturbing." Apu, after he found out Homer was only 39.
Marge's mother admission that Patty and Selma smoked when she was pregnant.
The great background bits with all the stuff on the amusement park ride and Bart being overpowered by Apu's kiRAB.
Overall, I really enjoyed this episode. I liked that Moe was actually the hero and not just his usual pathetic self. I also really liked the way that each of the other two husbanRAB were a part of the other's flashbacks. Lots of little great moments, as laid out above. The pictures at the end were sweet, too- especially great seeing Homer and Mona.