That was pretty nice. The dodgeball opening and feud was a little silly but it had a fun combination of flashback/new history and Marge's social life. Also, more importantly, it was consistently amusing once the plot kicked in - Homer and the other dads felt like a highlight. I did notice the resemblance of the scar to a sword toothpick pretty early but I guess that was intentional. (Actually I wasn't sure it would be important - from the time Bart asked about it until he meets the other boys in the treehouse it wasn't mentioned at all, even in response to his question.)
DYN: ...none of the other boys, moms, or dads from the club seemed to be named? (Right?)
Previous episode stuff MABF14: Tic Tac Toe: X v. O poster seen in Android's Dungeon Movie: Martin on flagpole (in its opening) used in tonight's too
Meta At the start of act 2, a license plate is seen that reads NABF03 (actually it looked like 01 at a glance but I'm assuming it was this own episode's code).
Goof? The 5th grader against Bart in the dodgeball showdown catches the ball after all. Fine, so he's not out. But shouldn't that just mean the match continues, not that he automatically wins?
Various other (kind of silly as notes go):
-Homer makes a big show of the taxes in act 2, and (on Fox at least) there was an elaborate H&R block ad in the commercial break just before it. I mention this mostly because they both stuck out, and it's not really tax season yet.
-Homer makes an annoying clock-ticking sound while meeting with the dads. It's actually pretty close to the sound I like to make sometimes when waiting at a red light (mimicking a turn signal). People find that annoying too, but sometimes I just can't help it.
-Homer's book of already-solved crossword puzzles is actually not such a terrible idea. He found it a fun source of trivia/vocabulary, but of course it would also be useful for learning obscure words and techniques for puzzles of the same skill level.