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 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 Bart tied an object to a bird's leg for his own purposes occurred in "Lost Verizon".
The last time Nelson didn't feel like delivering his catchphrase due to a parental problem occurred in "A Milhouse Divided".
This episode explains that Lisa has a fear of pigeons, yet in other episodes featuring pigeons, Lisa didn't show fear 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.