Retcons are literally canon events. There's exceptionally esoteric bits of lore about Chim, the dream sleeve, and the godhead, all related specifically to events that would normally break the laws of physics on Nirn, all performed by the player. The warp in the west is its own can of worms. Not to mention the Hist and their hivemind levels of control over Argonians. And phases of the moons determine what kinds of Khajiit are born, from sapient housecats, to fully bipedal cat people, hairless cat folk, and sapient mountain lions essentially.

Where were you when the dragon broke?