A debug option is available on the bottom of the options menu, which allows the player to go to any level and any panel in that level.

The credits are in the options screen, since the game does not have an ending at this point.

Also, on the title screen, it says 'PAT.

The Comix Zone logo does not bounce into place.

The intro logos are very different compared to the final's.

The prototype's header is 'JOE PENCIL IN THE COMIX ZONE', followed by the French 'JEAN CLAUDE CRAYON DANS LE ZONE COMIQUE'.

The 'DON'T LOOK AT THIS!' message at the top of the ROM is missing.

Defeating Mortus sends the player back to the first level.

There are no enemies or objects in this level.

In the beginning of the page, there are 2 Strigils instead of 3 Spawn Mutants.

The levels are not finished by this point.

The mission is 'OF UTMOST IMPORTANCE', instead of just 'CRITICAL'.

The conversation is glitched in the prototype, as some of the dialogue is not displayed in the game.

General is abbreviated to 'Gen.' in this build.

WELL, SKETCH, THIS MISSION IS OF UTMOST IMPORTANCE. Sketch and Allisa's conversation at the beginning is different.

Items are not present in the intro panel.

Note that levels are not categorized as episodes, so they are not here.

In this prototype, it's 'GAME OVER, MAN, GAME OVER!', which is a reference to Aliens.

In the final version, if Sketch dies on the last life, he will say 'GAME OVER, MAN, THE END'.

However, the messages that show are much more varied in the April prototype:

In the final version, when pausing the game, Sketch will say 'SEGA!' after 7 seconds.

When you don't press any buttons for a while, Sketch starts talking to player in the prototype.

You can not hold the A button to have Sketch make a paper airplane.

When an enemy is attacked and they hit the edge of the panel, a green 'Slam!' graphic will appear.

The 'SEGA' boot-up music sound entirely different than the final.

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