I saw a few new runners popping up and in trying to find some new routes in seeing the improvement I found a new clipping method. I've tested it in two spots (in Marco's room in level 1 and the coat room at the start of level 3 and both worked) but I cannot figure out a some what consistent method of it.

By crouch jumping to a closet that you can hide a head body in, you can clip into it and then using pause buffering while 'falling' up and down inside the closet you can use this to get on the roof above. I cannot figure out a consistent angle or timing for this so i'll leave the knowledge out there.