Clipping: passing through geometry that has collision This can skip major parts of the game.

Voiding: going off the map in places with no death trigger

This can skip major parts of the game.

AI Jump: using the AI's ability to jump in places a human player cannot

This can skip major parts of the game.

Phantom Carry: retaining a hitbox from a carried item in order to push things

This can be used to clip through things or push objects in unintended ways.

Unintended Trigger: touching parts of an event collision box that extend through walls in order to skip game actions.

This skips intended parts of gameplay in a glitchy feeling way. It looks like you're clipping through a wall.

Trigger Skip: Avoiding a cutscene trigger by utilizing character swapping

This can break the game.

Animation Cancel Quit: Speeding up game animations by quitting out of a character mid-animation.

This can break the game.