Unverified. Item infinite duplication (this is for the PS3 version). Save before doing this glitch, just in case.

Get as many scrolls as you want of the same type.

Click twice on the scrolls.

Drop the item you want duplicated. It has to have a quantity of one. So drop the extra quantity first.

Exit the menu and collect your items.

If you have 10 scrolls of the same type, you'll get 10 items. If you have 70 scrolls of the same type, you'll get 70 items. Be careful. If you duplicate too many items at the same time the game can freeze.

Example: with lockpicks it is better to duplicate in small quantities, about 20 at a time is the limit. I duplicated more and I had to restart the system.