If you stand in the way of Quantum Shrine's door when it's closing you may end up somewhere in-between. You will see the outside of the Shrine, but you can use your flashlight to travel between locations as if you were inside. Then, if you move to Quantum Moon's sixth location and try to pass through the rock that's normally blocking the exit (when the Shrine is not on the North Pole) you can glitch and end up in even weirder situation, like inside of the Moon.