Semi Frequent Undertale Factsさんのイラストまとめ

* However in December 2016 the image was updated, while its name was still him.png the text changed, it now said “THREE HEROES APPEARED TO BANISH THE ANGELS HEAVEN” a quote referencing Deltarune's prophecy.
Sources: https://t.co/Munkn4vfov
https://t.co/WC74VK8Wv3

* The webtoon Eddsworld has had two (or one) Undertale references, in 'Saloonatics' with humanized versions of Catty and Bratty and in 'The End (Part 1)' with Temmie's persona in the background, which served as a base for the Temmies
Submitted by:@AmbientRainfall & @InoobmasterI

* There's a few instances when the title for the game will change in windowed mode.
Note: During the fake intro the name will change into multiple random sets of letters.
Submitted by: @degree_celc1us
Chara Source:https://t.co/8EDssUejeP

* Killing the Snowdin Canine Unit or Papyrus will make this NPC send his kids inside his house so they are safe.

* The game forgets if Papyrus captured you after you beat him (a coding error perhaps?), but if you edit your save file and you interact with the shack you can get extra dialogue from Papyrus and Undyne, funny how he actually does what Undyne made up in the spot.

* The Indonesian Webtoon 'Born From Death' has an Undertale reference on Season 3 Ep. 5.

Submitted by:@isnivite

* If you eat the Snowman Piece in front of the Snowman, they won't give you a second piece and they will also feel disgusted.

* The way Monsters (in UT) work is that because they are made of magic, depending on the attacker's intent, an attack will hurt them more or less. Usually when a monster spares you, their defenses lower so attacking them deals a lot of damage since the intent is extremely cruel.

* Goner Kid also has exclusive dialogue if you talk to them with the umbrella. And you can't travel more through Waterfall or outside of it.

Source:https://t.co/EpGP4ND34x

* Iam8bit's Undertale Vinyl Soundtrack original had Mystery Man both on the cover and on the art from the inside (next to a Gaster Follower and an Amalgamate) The trio was removed. (Though the follower was still on the cover.)