Minecraft wiki entry for Guardian, associated text: A guardian's eye is actually the "head" part of the mob's model. This gives the illusion of a dynamic eye.
Guardians' laser-beam attacks are affected by the potion of strength, which normally affects only melee attacks.
When placed or spawned on a slime block, guardians start bouncing and continue and each bounce higher than the last, until each bounce brings the guardian to 17 blocks height.
In the texture file for the guardian, "jeb" is written in the bottom right corner.
If summoned with {NoAI:1}, the guardian's eye still follows the player.
In Bedrock Edition, guardians do not make the flopping sounds while on land.
If a guardian is placed in a 1.5 block tall area a top slab on the 2nd block, it flops faster.
World corruption can cause guardians to turn into Elder Guardians.