Something that totally shocked you learning it or realizing it. I might be using the wrong wording here, but ill give you my example:
In Ocarina of Time, we all know the Triforce was cut, or otherwise not something you get in the game, save for in the cutscenes towards the end. BUT - did you know you can actually go find it and see it in the game?
If you have a Gameshark, turn on the levitation code. Go go Zeldas Cortyard in the room where she is, and fly over the wall. When you fall, you’ll land in a pool of invisible water, and underneath the center of the room with the flowers, look down - there it is. Can’t interact with it, but you can see it, and i choose to believe putting it in that exact spot was intentional for lore reasons.
What do you got?
The whole idea of the Dragon Break/Warp in the West is one of my favorite pieces of game nonsense ever. Yes, all 7 endings of Daggerfall are simultaneously canon, because Akatosh got really drunk and so 7 different people all simultaneously obtained control of an artificial god and proceeded to do god things with it. Time just didn’t exist for a while, don’t worry about it.
Also it created a new god out of the super powerful emperor from a few centuries ago (except now he’s retroactively always been a god), don’t think about it.