The aspect of the Simpson family going into Homer's dreams, one at a time, is a parody of the Christopher Nolan film Inception. Further references to the film include:
A dream involving skiing on a snowy mountain.
Entering a dream within a dream to slow their descent.
Arriving at the deepest dream layer with high rise buildings next to a beach (depicted as discarded food, beer cans, and beer bottles in the episode), which begin to collapse.
Walking up a vertical road in a dream.
A spinning top that topples in real life but spins indefinitely in a dream.
The closing credits feature audio of the song "Dream Operator" written by David Byrne with vocals from David Byrne and Glenn Close. The song originally comes from Talking Heads' penultimate album, True Stories.
When Smithers goes into the supply closet, two 'turrets' from the hit game Portal come out to shoot him, Smithers quickly uses a Portal Gun (also from the game) and portals them away.
The slow-motion fight between Clancy Wiggum and Professor Frink is a reference to The Matrix Revolutions where Neo punches Agent Smith in the face in slow-motion.
Trivia[]
This episode marks the second appearance of B.F. Sherwood. B.F. Sherwood also has the longest gap between his first and second appearances of any other recurring character. His second appearance in "How I Wet Your Mother" was three shorts and 502 episodes after his first appearance in "Family Therapy."
Dan Castellaneta voices Robin Williams. This is the second time Castellaneta has imitated Williams's voice on the show, the first being Aladdin's Genie in "Mypods and Boomsticks". Coincidentally, Dan Castellaneta was hired to replace Robin Williams as the voice of Genie when Disney's Aladdin movie was turned into an animated series, as well as in the Kingdom Hearts game series.
This is the second episode where a Simpson dresses up as the Grim Reaper. The first was "Treehouse of Horror XIV".
Homer mentions that his sheets would be as dry as the surface of Mars, except for the poles. Ironically, a few months after this episode was aired, the Mars Curiosity Hover found water streams and lakes on craters outside of Mars' poles.
Goofs[]
The configuration of the Uralarm Whizz-No-More 9000 changes as Homer plugs the alarm mechanism into the main console.
As Homer was thinking of Apu, a picture of a younger Mona featured her with white hair instead of auburn.