To make this glitch, you will need two save files, one saved in inkwell hell and the other on inkwell island 1. To make this glitch is simple, start your save with any % and press the up or down button and the select button. This will cause the game to start the original save, but in a new save, allowing you to skip the intro scene and the elder kettle house, if you collect 1 coin and exit the save it will not appear in the slot selection as no % has been made, but if you do the same thing using your save from inkwell island 1, you will start the save but with 1 coin allowing you to skip any 1 of the forest follies coins.
The wrong warp has been known for a very long time, and the rules clearly state that use of other save files is not allowed unless executing the fresh expert/simple glitch.