Chalkboard: I will not grease the monkey bars

Couch Gag: The family rushes in, only to find Grampa sleeping on the couch. They accidentally wake him up and startle him.

This episode marks the first appearance of Professor John Frink.

This is the only episode to list the voice actors and the characters they play simultaneously in the closing credits.

(Grampa mourns Bea alone in his room.)
Lionel Hutz: It was a beautiful service, wasn’t it, Mr. Simpson?
Grampa: (Yells) Who the hell are you?
Lionel Hutz: Lionel Hutz, attorney-at-law! I’m the executor of Beatrice Simmons’ estate. Mr. Simpson, Bea was a wealthy woman and, surprise, surprise, she left everything to you.
Grampa: Really?
Lionel Hutz: There is one catch. You must spend one night in…a haunted house!
Grampa: (Gasps)
Lionel Hutz: (Chuckles) Just kidding, just kidding.

Grampa: Eh, what are you, uh, doing tonight?
Bea: Sitting alone in my room.
Grampa: (Disappointed) Oh, well, if you’ve got plans already--

Grampa: Out of my way, I got a date with an angel.
Jasper: You don't know how right you are, Abe.
Grampa: What?
Jasper: I'm sorry to be the one to tell you this, but Bea passed away last night.
Grampa: Oh no.
Jasper: It was her ticker. The doctor said her left ventricle burst.
Grampa: No, Jasper. They may say she died from a burst ventricle, but I know she died of a broken heart.

Bart: Ya know, Grampa kinda smells like that trunk in the garage where the bottom's all wet.
Lisa: Nuh-uh. He smells more like a photo lab.
Homer: Stop it, both of you! Grampa smells like a regular old man, which is more like a hallway in a hospital.
Marge: Homer, that’s terrible! We should be teaching the children to treasure the elderly. You know, we’ll be old someday.
Homer: (Gasps) My God, you're right, Marge! You kids won’t put me in a home like I did to my dad, would ya?
Bart: Well…
Homer: (Screams) Marge, what do we do!?

Grampa's girlfriend dies in the middle of the episode, but in the end, seconds before the end credits, you can actually see her walking behind some old people.

In the scene which Lionel Hutz hands over the $106 check, Grampa's room number is 18. After Grampa called Homer, the manager of the Retirement Castle comes in. The number 18 is gone.

If I Had a Million

This episode's ending, in which Grampa uses his money to fix up the Springfield Retirement Castle, is very similar to the ending of the 1932 film.

Mr. Deeds Goes To Town

The scenes in which Springfield residents present their ideas for how to spend Grampa's money is loosely based on the 1936 film.

Batman:

In the scene where people are queued up to pitch their ideas on what to do with Grampa's money, The Joker (one of Batman's many enemies) can be seen in line.