Minecraft wiki entry for Ender_Dragon, associated text: Health depletion effect of The Void does not affect ender dragons.
If low enough on health, the ender dragon emits beams of light without dying, as if she cracked.
Name tags cannot be used on an ender dragon.
The ender dragon's hitbox is larger than the ender dragon herself, causing players to be pushed away from her.
If the player kills a summoned dragon in the Overworld or Nether, she does not create a portal or an egg.
In Spectator mode, the player cannot view the perspective of the ender dragon, unlike any other mob. However, it is possible through the use of commands (like /spectate). When this happens, the player's camera appears about 1 block over the dragon's body.
Using F3+B to show hitboxes reveals that the ender dragon's head rotation faces in the opposite direction to where her real head faces. This is also why the ender dragon faces the wrong way when set in a monster spawner.
When an ender dragon is spawned in the Overworld, she flies to coordinates x=0 and z=0 and dives at the ground or does the same behavior as if in the End. If end crystals are placed in the Overworld, they heal the dragon as normal, but she does not perch anywhere, and continues to fly around forever.
In Bedrock Edition, there is an unused texture file for a dragon fireball item.
In Super Smash Bros. Ultimate, one of the spirits that comes with the Steve/Alex DLC is the ender dragon. She appears as a Legend-class "spirit" that makes the user breathe fire for a long time at the start of each battle.
A wither that is summoned to battle the ender dragon cannot deal damage because the ender dragon flies too fast, and she is immune to projectiles when perching.
If commands or creative mode are used to get end portal frames and eyes of ender, a player can basically skip to the end poem.
If a player destroys ender crystals or even hurts the dragon and then uses a player-made portal, upon returning, the player retains their progress.‌[BE only]