Cartoonish Items
Hold [F11] and type [TOMFDIGSMANGA].

Speed the Game Up
How to enable it: Hold down [F11] and type "RSHIFTSPEEDUP" (a VAL message will drop down once you have typed RSHIFT and another one when you finish typing SPEEDUP).

What does it do: If you hold down the right shift key and press the ">" key the game will speed up, the longer you hold it down the faster it goes.

Others are... RSHIFT then
> = Speed up
< = Slow down
L = reset to normal speed
: = ...

Scuzzer Cam
How to enable it: Hold down [F11] and type "RSHIFTSCUZZERCAM" (a VAL message will drop down once you have typed RSHIFT and another one when you finish typing SCUZZERCAM).

Hold RSHIFT then
NP_7 = forward
NP_8 = backward

NP means number pad (the square of numerical keys over on the right of a standard keyboard). When you use them the NumLock must be off.

Speccy Effect
How to enable it: Hold [F11] & type [CLIVEROOLZ].

Once = traditional 256x192 pixel Spectrum mode.
Twice = high-res Spectrum mode.
(i.e. using whatever rez you chose).
Thrice = back to normal.