When you crouch and then stand up, you get stuck obviously. but if you do it while moving in very specific areas, interesting stuff can happen.

I haven't found anything crazy, but there are areas exclusively in the pool level (from what i have found so far) allows you to go out of bounds. Although There are borders everywhere so you cant really go anywhere but down.

Example:

I was trying to see if I could skip to another level with this, but I think the game loads in levels instead of just teleporting the player (like gmod and outlast)

(I also found if you barely go in to an elevator without getting behind the visible wall, the elevator can shut close with you outside of it and load the next scene. Probably not useful though.)

I tried the elevator trick you mentioned, and when the game loads, it spawns you in the elevator instead of outside of it.

Still a neat find though.