More notes:
Both the SSG and chaingun lack muzzle flash sprites.
Bullet puffs are white and grey rather than yellow.
Imp's and Caco's fireballs use the Imp's fireball sprite from PC Doom.
The BFG ball upon impact doesn't have an animation, and lingers on one of the ball sprites.
Speaking of the BFG, the green placeholder sprite shown above is used on the BFG fizzle sprites when a monster is hit by one of its rays.
The HUD is white as opposed to red, and only shows values for health, ammo, and armour from left to right. This means that keys aren't shown on the HUD at all.
The chainsaws animation isn't finished, so the blades don't move when idle or firing (holding a chainsaw forward without actually using it isn't gonna get you far, Doomguy).
New idle hand sprite! It's open and not closed:
That early Unmaker shown in the above magazine has a sprite called LSRGA0, which is the same name as the Unmaker's sprite in the final version:
Here's a rip of that green placeholder sprite, conveniently named TESTA0:
Also, with how much unused and early sprites/content there is I'm not sure if I'll be able to cover them all, so I'll leave it at here for now. I'll add screenshots for these notes eventually though.