if you have spoiled meat, equipped it and quickly press drop button. If you did it right, the meat won't drop and will become fresh again if you do this with dried meat it turns to raw.
With certain walls, like rock walls, you can mash the jump button and the player can literally climb up the side of walls. You can do this glitch within the sinkhole. Walk to the side if the cliff and start mashing the jump button, and you will start climbing up the wall. Only seems to work with rock walls related to what the sides of the sinkhole are made of.