I'll post all the ones I know of.
Speed Glitch: Use bike in the chair while asleep
Double Speed Glitch : Use bike in chair, then take chair out to nexus. Press 5 to drop effect. Equip bike again then go back to desk and exit chair at the desk.
Use effects with speed glitch: Equip Yukki-Onna in chair, then hat and scarf. Take the chair and activate the hat and scarf effect. Then equip desired effect and put chair back and exit chair.
Walk through walls: Use knife in chair. Leave chair and immediately after activate the knife effect.
Softlock game on rocket ship: while the ship is crashing hold down sit and you will not be able to get back up or do anything.
There are a few other very minor glitches but those are the most noticeable and useful ones.
Anyone else know any other glitches? Post too long. Click here to view the full text.