you can get stuck in the tutorial key room // you can crouch through the hole next to the door

[hollow mesa]

two bugs in one! if you parkour your way over the top of the key room, you can get stuck in it (not really, due to this secondary glitch!) you can also crouch through the hole next to the door.

also, to add on, the table in the key room can be walked through.

[icy stream]

you forgot to unlock the door with the key