Junction Trick is a glitch that makes the game think you are going down a certain direction but you actually go down the other one.
This occurs when you change the direction of a junction on the last available frame.
In this video, I did it on the last junction so I went left (the correct way) but the game though I went right (the wrong way) so it makes me go back to the forest entrance.
If you do it on a junction in this forest, the direction trees won't load up anymore but you can still make your way to the exit (you'll have to guess by yourself the correct path tho).
This glitch have currently no uses.