Holidays of Future Passed/References

Cultural references

 * The title is reference to the Moody Blues album Days of Future Passed.
 * Krusty's televised rant and his surroundings are similar to those by the late 60 Minutes personality, Andy Rooney.Madmax.png
 * When Lisa first enters the ultranet, the first thing she does is respond to friend requests most likely those from Facebook.
 * Several of Homer's ships in bottles are fictional futuristic spaceships such as the Discovery from 2001: A Space Odyssey and the Planet Express ship from Futurama.
 * The air travel shown is highly similar to themes and characters of the series.
 * When Marge makes the cookie recipe appear may be a reference to Back to the Future: Part II.
 * Me and Julio Down by the Schoolyard plays when Homer takes Bart's kids to find his dad.
 * One of the teleporters goes to New New York from Futurama.

Trivia

 * Lisa Simpson married Milhouse to presumably become Lisa Van Houten, unless she didn't change her name when she got married.
 * Martin Prince has undergone a sex change to become Martia Princess.
 * Just like previous flash-forward episodes, Maggie never says anything. The robot nurse told her not to say a word for the duration of her pregnancy from that point forward. In addition, there were points when she was about to speak, but was interrupted by her own contractions and Abraham. However, she is shown to be a world famous singer, enhancing the gag through irony.
 * When Homer visits his dad in the cryogenics facility, other people seen in suspended animation include, Crazy Cat Lady, Superintendant Chalmers, and Agnes Skinner. The last time an elderly character was frozen was in Lisa the Simpson where Jasper freezes himself in the Kwik-E-Mart. This time Abe actually became unfrozen in the future while Jasper thought he was in the future when he became unfrozen.
 * Lenny and Carl have switched brains.
 * This is the fourth episode set in the future and longest gap between two episodes set in the future.
 * Lisa's great-great-great-great half aunt, Eliza Simpson, married Milford Van Houten at some point in her life. This means Lisa is unknowingly married to her distant relative.
 * According to Ned, Homer is the reason Edna is dead, meaning they were together well into the 30 years between settings. This is also a play on Homer being the reason for Maude's death.
 * Nelson and Lisa's relationship from Lisa's Date with Density is referenced as Nelson tries to win Lisa.
 * Lisa also questions if she should have married Nelson, indicating that they were once together. This also indicates that Nelson proposed to Lisa sometime before she married Milhouse, most likely at the same time as he Milhouse had proposed.
 * Lisa says that her and Nelson still talk, saying that, " Someone calls someone. " when Bart says, " Nelson calls you? ", indicating that she calls him, and not the other way around.
 * Jenda from Future-Drama appears in a picture. It's revealed that she married Bart, had two children with divorced him, and married her new boyfriend in secrecy.
 * At some point, paper cash will no longer to in use, according to Apu.
 * It appears some of the The Nahasapeemapetilon Octuplets have gotten married as hinted with sindoor some have and have octuplets of their own.
 * Schools at this time period are now banned from talking about the meaning of Christmas, according to Bart's sons.
 * The name of what illness that got Abe is never mentioned, nor explained how it was cured.
 * The name of the father to Maggie's daughter is never mentioned.
 * It is implied that Lisa went through a bi - curious phase in college.
 * Lisa is shown baking cookies, and apparently does so very well.
 * We learn Sanjay Nahasapeemapetilon was killed in a hit and run, based on what Apu explained.
 * Mr. Burns last released the hounds at Christmas in Dude, Where's My Ranch?

Goofs

 * In the description of the Sky 1 airing of the episode, there is a mistake saying it is the fifth episode of Season 23, not the ninth.
 * There are only 42 octuplets of the octuplets. If all of the octuplets had octuplets, there should be 64.
 * This is either a goof or not all of them are there.
 * Grandpa's hat is slightly lower down in the reflection of himself.
 * Zia's door on the Ultranet says Zia Simpson, not Zia Van Houten. (This is not a Goof, on Lisa's Christmas Card it says a complicated "Merry Christmas from Simpson-Van Houten-Simpson-Simpsons" which may imply that Lisa kept her last name, Milhouse took on the heiphenated Simpson-Van Houten surname and Zia has her mother's last name. As her genetic make up is 100% from Lisa and also Lisa's character has stong feminist qualities.
 * Carl (with Lenny's brain) tells Lenny (with Carl's brain) to stop making Lenny fat, but in Sweets and Sour Marge, Lenny is one of the people in the sugar, and even looses some of his teeth.
 * When Lisa enters the Ultranet she comments that it is Dr Seuss' birthday as indicated by the design of the Google page. Dr Seuss' birthday is infact March 2nd and this episode takes place over Christmas.