History ShoutOut / Deltarune

* At the beginning of the mecha fight, Giga Queen exclaims [[WesternAnimation/KungFuPanda "Finally... a worthy opponent..."]]

* Carrying over from ''Undertale'', the Loox encountered outside Asgore's shop in the epilogue has the internal filename "Mike Wazowski", referencing its resemblance to the ''WesternAnimation/MonstersInc'' character.

* The name of the battle theme, "Rude Buster," appears to be a homage to a UsefulNotes/PC98 ShootEmUp game titled ''Rude Breaker''.

* When Kris and Susie first enter the library to study for the group project, Susie says "screw it" and opens up the door to the computer lab so that "they can play Space Pinball", which is how they find out it became a Dark World in the first place. "Space Pinball" is a reference to ''[[VideoGame/FullTiltPinball Space Cadet]]'', a pinball game featured on consumer copies of UsefulNotes/MicrosoftWindows.

* The background when Queen contacts you via Video Chat in her castle features her in front of a pastiche of [[https://en.wikipedia.org/wiki/Bliss_(image) Bliss]], the default wallpaper for [[UsefulNotes/MicrosoftWindows Windows XP]].

* In the Chapter 1 Epilogue, you can speak to Burgerpants about of co-workers, one of which is [[Franchise/FiveNightsAtFreddys Purple Guy]], who he's not even sure works there.

* In Chapter 1, Toriel asks Kris about the game they and Asriel used to play, asking if it was called ''[[VideoGame/SuperSmashBros Super Smashing Fighters]]'', and mentions how Asriel liked "the green lizard," referencing [[VideoGame/YoshisIsland Yoshi]]. And for a triple whammy of references, she then talks about how Asriel hated [[Creator/DrSeuss "that book about eating green eggs"]] after his father cooked some eggs that were decorated to look like Yoshi's eggs. Chapter 2 would continue references to Asriel's love of Yoshi, as Alvin remarks that when Asriel was younger, he would tearfully confess his sin of "dropping the lizard in the pit to jump high" in a video game. This is a reference to a stage in ''VideoGame/SuperMarioWorld'' where you have to dismount Yoshi over a BottomlessPit in order to reach a hidden exit, sacrificing Yoshi to do it.

* The way the song title is shown when you enter the Field is similar in style to the ''[[Franchise/TouhouProject Touhou]]'' games. The song in question is clearly inspired by ''Touhou'' music as well.

* Another Lancer-related [=EarthBound=] reference comes if you talk to him twice when you first gain control over the team in Castle Town near the start of the chapter. He'll tell you that you "won't get through your teen years without at least one Egg", a reference to an egg-seller in [=EarthBound=] who gives a very similar response if you turn down his offer to purchase an egg from him.

* Queen's proposed "robot face" for Noelle, which also appears scribbled on the box that Noelle wears as a PaperThinDisguise, is a crudely-drawn rendition of [[WebSite/{{Twitch}} Twitch's]] :) emote, a simplistic smiling robot.

* There is an Addison that sells tea based on the flavor of your teammates. When drank by their respective team member, they only taste water, but other people's tea taste like how they imagine that person. In Literature/WaysideSchool, the students receive ice cream that functions similarly.

* If you don't use ACT against Berdly on your first turn in the first battle against him, he tells you that you're meant to use the coasters you're riding on as bumper cars, which he refers to as playing "bump of chicken", which is the name of a J-Rock band best known for composing theme songs for games and anime such as ''VideoGame/TalesOfTheAbyss'', ''VideoGame/FinalFantasyType0'', ''[[Anime/GranblueFantasy Granblue Fantasy The Animation]]'', ''Manga/MarchComesInLikeALion'', and ''Anime/JuushinkiPandora''.

* When the Delta Warriors pose after first reuniting in the Cyber World, Susie performs [[VideoGame/ChronoTrigger Crono's]] VictoryPose.

* One of the items Queen gives to Kris is based on their search query, "sharpest kitchen knife jello", and one of the ads Poppup will show Kris if you Click on them is for a video about making knives out of spaghetti. Both of these are references to the ''WebVideo/KiwamiJapan'' [=YouTube=] channel, which is famous for making knives out of improbable materials like [[https://www.youtube.com/watch?v=Oadf4KNYz-I Jello]] and [[https://www.youtube.com/watch?v=MeNR0guNn70 pasta]].

* A possible example: in this universe, Alphys's and Undyne's first meeting of consequence consisted of Undyne destroying the former's bicycle (over a misunderstanding). This also happens to be the way [[Anime/PokemonTheOriginalSeries Ash met Misty]].

* If you buy the Keygen from Spamton and then ask him about it, he will say nothing but "KEYGEN," and start flashing rainbow colors while dramatic {{chiptune}} music plays. This is a reference to, of all things, the classic WebAnimation/YouTubePoop [[https://www.youtube.com/watch?v=4bM2b5cfeZo "The King Downloads Sony Vegas"]] (epilepsy warning), which itself nods to the prevalence of {{chiptune}} music and rainbow colors in keygen, cracktro, and installer programs among digital pirates and {{demoscene}} creators.

* Spamton on the Weird Route refuses to be an "Extra Boss"-- while the concept of a BonusBoss isn't unique to the series, and the phrase "Extra Boss" sees usage elsewhere, the term is most commonly associated with the ''Franchise/TouhouProject'' and the bosses of its [[BrutalBonusLevel Extra Stages.]]

* [[https://twitter.com/_ggdg_/status/1440091998241710098 A piece of concept art]] by staff member Gigi DG features a note giving away that the entrance to Queen's mansion was designed after "that Franchise/{toy story}} ride," specifically the [[Ride/DisneyThemeParks Tokyo DisneySea]] version of ''Toy Story Mania!'' (whose entrance is a giant grinning effigy of Woody's head).

* [[https://twitter.com/_ggdg_/status/1440091998241710098 A piece of concept art]] by staff member Gigi DG features a note giving away that the entrance to Queen's mansion was designed after "that WesternAnimation/{{toy story}} ride," specifically the [[Ride/DisneyThemeParks Tokyo DisneySea]] version of ''Toy Story Mania'' (whose entrance is a giant grinning effigy of Woody's head).

* If you buy the Keygen from Spamton and then ask him about it, he will say nothing but "KEYGEN," and start flashing rainbow colors while dramatic {{chiptune}} music plays. This is a reference to, of all things, the classic WebAnimation/YouTubePoop [[https://www.youtube.com/watch?v=4bM2b5cfeZo "The King Downloads Sony Vegas"]], which itself nods to the prevalence of {{chiptune}} music and rainbow colors in keygen, cracktro, and installer programs among digital pirates and {{demoscene}} creators.

* In certain areas, you'll be treated to some pitch-bendy sine wave ambience that resembles the kind you would hear in ''VideoGame/EarthBound''.
* Much like the Onett PD in, again, ''VideoGame/EarthBound'', the local police department — Police Chief Undyne in particular — has the exit to town sealed off with a barricade and police tape for no particular reason.

* While battling [[{{Superboss}} Jevil]], one of your party members can use an ACT to "make something spin around", in reference to the [[VideoGame/EarthBound Mad Duck's]] equally vague description of their ManaBurn ability.

* When Lancer enters your inventory as a key item, his initial quote is "Hohoho! I'm a tough boy! Treat me like one of your ITEMS!", referencing a line of dialogue from ''VideoGame/{{Earthbound}}'' that an NPC tells you upon getting an Exit Mouse ("He's a tough boy. You can treat him as one of your items.").

* The giant toilet sprite is placed as a roadblock in Cyber City doubles as both a DevelopmentGag and another reference to ''VideoGame/{{Earthbound}}''. The text states, "For some strange reason, a giant [[ShapedLikeItself toilet-shaped toilet]] is blocking the way", referencing the similar line "For some weird reason, a pencil-shaped iron statue is blocking the path" in ''[=EarthBound=]''.
* If you inspect the gold statue of Berdly when you find it in the toilet, it'll state "no problem here", the default phrase that appears when using the "Check" command in ''VideoGame/EarthBound''.

* The secret "Get Lancered!" and weather NPC pages have the title "[[Website/{{YTMND}} You're The Annoying Now, Dog!]]" They even have tiled image backgrounds, static [=WordArt=] text, and looping music, just like a page on the site.

** An image one can get from the "secret" page shows a screenshot for the Wikipedia page of [[https://en.wikipedia.org/wiki/Superbad_(website) Superbad.com]].

** On the Spamton Sweepstakes website, the comments section on one of Noelle's blog posts has Berdly mention that he started a ''Minecraft'' session with the person who kept prank calling him.

* If you manage to recruit Hacker into your town, you can chat with him on the giant stone pillar west of the town's entrance — he'll say that the town is nearly as good as the one he made in ''[[WebVideo/MinecraftWithGadget Minecrap]]''. Another reference to "Minecrap" is made by Spamton on the Weird route.

** The comments section on one of Noelle's blog posts has Berdly mention that he started a ''VideoGame/{{Minecra|ft}}p'' session with the person who kept prank calling him, referencing how Inspector Gadget pronounces the title in ''WebVideo/MinecraftWithGadget''.

* The secret "Get Lancered!" and weather NPC pages have the title "[[Website/{{YTMND}} You're The Annoying Now, Dog!]]" They even have tiled image backgrounds and static [=WordArt=] text, just like a page on the site.

* The secret "Get Lancered!" and weather NPC pages have the title "[[Website/YTMND You're The Annoying Now, Dog!]]" They even have tiled image backgrounds and static [=WordArt=] text, just like a page on the site.

** The comments section on one of Noelle's blog posts has Berdly mention that started a "VideoGame/{{Minecra|ft}}p" session with the person who kept prank calling him, referencing ''WebVideo/MinecraftWithGadget''.

** The comments section on one of Noelle's blog post has Berdly mention that started a "VideoGame/{{Minecra|ft}}p" session with the person who kept prank calling him, referencing ''WebVideo/MinecraftWithGadget''.

** The description of the Banana in the finale stream is "Ooooh..." This is in reference to the memetic voice clip "Oooh, banana" hailing from VideoGame/DonkeyKong64, a voiceclip that Spamton A. Spamton's actor, Wayne, has as an alert sound.