They just keep upping the ante on these Couch Gags, don't they?
I'm generally not crazy of using recycled plots (sounds too much like Bart raising bird eggs that turn out to be lizards), but Bart's antics with the pigeon were hilarious. Unfortunately, it intersected with the recycling of every "Dump Santa's Little Helper" plot, which I couldn't care for too much. I do, however, love watching Bart do the strangling this time around.
Milhouse: I thought your race car was a Transformer. Nothing's one thing anymore!
I read somewhere (that I can't find the link to now) that they are trying to cast Angel (who was filmed for X2 but cut out) and have casted Lost actress Maggie Grace as Kitty Pryde. http://www.efavata.com/CBM/Xmen3.htm