On the left side from the entrance of the enchanters cellar it is possible to clip into a barrel.
The barrel in question
How to:
it is possible to clip into the barrel by jumping at the corner of the barrel right beside the broken barrel.
After a few tried it usually clips the player into the barrel.
Extra note:
I have also managed to clip through the wall behind the barrel once by using Fire Walk, but i have not been able to reproduce the wallclip even after trying 15+ times.