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A dragon head is invisible if the entity wearing it is not in view

Whether or not a player experiences some effect is calculated based on the block under the center of the player

Spiders climb up the edge of the world

Glass panes stick to edge of world

Snow sometimes doesn't occur naturally within 8 blocks of the edge

Walking around anvil edges

Entities disappears on edge of screen

Dark Lighting Along World Edge

Water Particles when sprinting on the edge of blocks / falling down besides water

Walking around edge-corners with blocks above your head

Sprinting/Landing on the edge of a block that's next to water will cause a shockwave of water particles instead of particles of the block you're on.

can stand on the border wall

Terrain Behaves Very Strangely Near World Edge

Falling Sand doesn't get killed if falling on edge of block