Start a game in multiplayer mode and give all gold to one character. Then, save the game for the character with the gold, but not the other character. Restart the game, and the player that was not saved will have the same amount of gold present before giving it to the other character. Now repeat this process to build an unlimited amount of gold. Note: This may also be done with elixers after they appear in the game to allow a character with enhanced attributes to be built.
Beat the game on "Hell" with any character, start a new game right after and go to Load Character, hold Left and you will get an alternate version of the character you beat the game (on Hell) with. Beating the game with the Warrior gives you a Bard, the Sorceror gives you a good version of Adria (the witch from town) etc.
Drop nine items on the floor around you so you cant drop anymore then select your chosen belt item eg. health potion, select it and press triangle, there should be an extra potion lying on the ground two spaces away, you should now have another health potion. You can do this as much as you like but if you decide to drop the belt item you duplicated it will vanish and you will be left with the one you started with.