Homer typing the same thing over and over spoofs the 1980 film "The Shining".
"Citizen Kane" is referenced multiple times throughout the episode, such as the "cane from Citizen Kane" and the scene where Homer tells Lisa, 'people will think what I tell them to think' and that she, 'can't do this to me, I'm Homer Simpson!' as she leaves the room.
Homer's dummy sings on it's recording a parody of Donna Summer's "She works hard for the money".
The ambulance that cut Homer off did not have its siren on, meaning it should be subject to the same rules of the road as any other vehicle. Lisa simply pointed out that it was an ambulance; Homer's tirade said nothing about any emergency.
There was a cane in Citizen Kane. However, it did not play a major role in the narrative, which may be why Lisa doesn't remember it.
In the scene where the restaurateurs, critics and animals are behind Homer and Lisa, and are about to give the former his comeuppance, Daphne Beaumont's lipstick disappears from her lips when she clenches her teeth.
Why are the overweight citizens giving Homer his comeuppance?
Marge tells Homer that the E key on the typewriter is broken, yet he is able to type "screw Flanders". Lisa probably fixed it.