Contributed by Dazz
The Butcher originally had a pre-rendered cinematic that would play when first encountered. It is left on the disk, but goes entirely unused.
If you recolor a part of the Diablo boot screen you will find a hidden message from the game's developers about Natalie Portman and "War II".
When the demonic boss "Diablo" is released in the final level, he says something in a bizarre language. When played in reverse, the voice is in English, and says "eat your vegetables and brush after every meal."