A character named Tremain the Priest does not appear in the final game

* A character named Tremain the Priest does not appear in the final game, but there are sound files of his speech in the game's main data file.

* Many hints for quests that never made it into the final game can still be viewed on the game's main data file. These include "Izual, the Fallen Angel", in which the player talks to Gillian the barmaid and receives a quest to find and destroy Izual to release his tormented soul. Another quest involved hunting down the demon queen Andariel. Both characters appeared later as unique monsters in Diablo 2 Items, Andariel as the boss of the first act and Izual in a quest in the fourth.

* Two cutscenes appear on the CD but not in the game. One of them is a video the player is supposed to see upon entering The Butcher's lair, and the other one is of Diablo 2 Items gaining power if the player fails the (never implemented) Map of Stars quest.

* Many item graphics were never used in the final game, including the Map of the Stars, which was hacked many times into the game and spread over Battle.net.

* One of the extra sub-quests from Diablo 2 Items supposedly involved Gillian. Gillian was involved in two quests, the first one she would issue early in the game. Rumor has it that Gillian requested that a cellar is cleaned in one of the town houses as "Giant Worms" had invaded the cellar. To complete this quest, the player needed to enter a town house. There is an abandoned house inside Tristram with an opened door which could possibly be the house the player was meant to clean up.

l It's believed that Blizzard originally only planned to have one character skin. This is backed up by early screenshots, which not only showed only the warrior skin, but also depicted the warrior skin using magic and ranged weapons. The early names for the classes were the Fighter, Archer and Mage.[10]