Proto:Fallout

Inventory Icons
Mentats

Mentats were taken intravenously in the demo. The filename for their graphic still reflects this.

Stimpak

In the demo, Stimpaks used the inventory icon for Super Stimpaks, and Super Stimpaks did not exist.

Tool

The tool was redesigned to looks like something more useful for fixing stuff, but retains its overall theme. Its name was also changed from 'Wire Cutters' (see text changes).

Water Chip

It looks like the Water Chip had a different icon, taken from the same render at a different angle with different lighting.

Vault Boy Images
Filenames in the demo indicate that these were not just changed, but repurposed entirely, and their use in the final does not reflect their original intended use in the GURPS system.

Note that Empathy is a perk in the final game, but uses a different (though similar) graphic with a woman in place of the mutated rabbit.

Quirks are what perks were called earlier in development.

The Sex Appeal trait is re-used in Fallout 2.

Unused Graphics
These are graphics present in the demo which have no equivalents in the final.

Interface
Early character interface, using statistics from the GURPS system.

The skill page, presumably where perks (called 'quirks' at this point in development) would be displayed.

Early skill names, which would have gone on the character editor screen. Artistic, Athletic, Professional and maybe Craft have no equivalents in the final, and everything else either has a different name or is missing altogether. Advantages and disadvantages were rolled into one to create traits.

PRO_ITEM.MSG
This is the text file which contains the names and descriptions for items, many of which were changed between demo and final. Most items lacked descriptions and all weapons lacked strength requirements, so only examples where the name or description are present and differing in both demo and final are noted.