The supposedly dead ostrich opening its eyes is a reference to the Giant Chicken fights in Family Guy, when Peter wins a battle with Ernie the Giant Chicken and Ernie awakening. The same music is played.
The scene in which Bart has a Chinese food box of worms could be a reference to a scene from the 1987 film "The Lost Boys."
The Itchy & Scratchy short is based on the 1935 Disney short Pluto's Judgement Day. The set up is similar with a bloodhound on trial with a jury of black cats. In the contexts of theirs plots, Bart shows the cartoon to Santa's Little Help in an attempt to teach him a lesson, which fails. In the context of the source material, most of the short is a nightmare Pluto has to scare him straight, which does work.
The last time Bart becomes supportive of birds occurred in "Bart the Mother", or he at least believed they were birds until they hatched.
The last time the TV fell down in the opening sequence occurred in The Great Wife Hope.
Lisa is scared of pigeons in this episode, yet in other episodes featuring pigeons, Lisa is not scared of them. She even thanked one in "Who Shot Mr. Burns? (Part Two)" while trying to clear Homer of trying to kill Burns. -That pigeon was relatively far away from her.