If you go near the wall of flesh and click on it/them, it/they will open up the guide's speech menu thing-a-ma-jig.
No Mushroom biome-related NPCs can spawn.
In every lunar event pillar, only Corites, Alien Queens, Nebula Floaters, and Crawltipedes spawn, making up the worst group of pillar enemies, ever.
The Underworld's spawn rate is 10x the original.
Slimes are replaced by a random boss enemy.
Smashing a demon altar will summon exactly 259.574275275 wraiths, don't ask me where I got that number.
The Brain of Cthulhu makes chicken sounds. The Eye of Cthulhu makes a "yuck!" sound. The Eater of Worlds makes a "ew" sound. The Empress of Light says "eel" all the time.
Eating an apple kills all existing nurse NPCs and renames the rest of your NPCs to Johnny Appleseed.
Applying acid dye and goggles to your head slots will cause you to-
Failing to score a goal 10 times in Terrarian golf at night will cause the Golfer NPC to transform into a furry.
Dungeons Guardians don't despawn.