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

* You can empty the Hotland water cooler by interacting with it with a cup from it multiple times, this will create a big puddle, during the True Pacifist ending, if you go back you will see how a tree grew from it.

Submitted by @OceansBelowZero and @time_stables

* Completing Waterfall will change most of the dialogue in Snowdin. (Some NPCs have different dialogue if Undyne was killed, this was already covered on this account.)

I won't show all of it but I'll show a few so you get the idea:

* Everyone knows about the bush camera from Snowdin, but there's actually multiple cameras all around Snowdin and even one in Waterfall.
(I believe there aren't anymore cameras but if that's not the case I will update this tweet)

* Killing Undyne on a Neutral Route will trigger exclusive dialogue for some npcs.

Below you can see a few:

* If you kill Papyrus on a neutral route, the town will notice Papyrus's absence (And Sans's too), this triggers special dialogue for some npcs. I'll show the most interesting ones: