Proto:DuckTales

Title Screen
The prototype has an option to continue at the title screen. This works perfectly fine, but it was removed from the final version anyway. Probably because Capcom thought that given the game's difficulty, it wasn't really needed. A trademark symbol was added, and the copyright text was adjusted. Strangely, the final version no longer has the copyright year in the text.

Money Matters
What would a game about accumulating wealth be without inflation? Between the prototype and final, all values relating to money were massively inflated. These changes made the Red Diamond worth five Large Diamonds instead of three, and the hidden treasures were bumped up to 100 Large Diamonds rather than 10.

Other money differences:
 * Refilling life by pressing Select costs $70,000 in the prototype, but $3,000,000 in the final.
 * The money required to pay off the statue in the Amazon was raised from $3,000 to $300,000.
 * When a level is completed, every 10 seconds remaining add $100 in the prototype and $1,000 in the final.
 * The amount needed for the good ending was raised from $400,000 in the prototype to $10,000,000 in the final.

Stage Select
All stages were given more descriptive titles...except for, oddly, The Moon.

Flintheart Glomgold's end-game message was adjusted slightly to take these changes into account.

The land money's dollar sign was moved to the left to allow for the adjusted money values. The money here counts down by hundreds in the prototype rather than ten-thousands, meaning that this sequence takes a lot longer to complete.

Dialogue Box
The in-stage dialogue in the prototype is confined to the tiny Time box. This was (thankfully) expanded in the final version, and now uses the same dialogue box as the items list.

Music Differences
Two pieces of music are different in the prototype.

Transylvania
Transylvania uses a completely different music piece in the prototype!

The Moon
The Moon theme in the prototype is about 20% slower than the final's theme.

Graphical Differences
Sometimes graphics are changed. These are those times.

The extra health item was changed from a cheeseburger to ice cream. Perhaps Disney didn't want an anthropomorphic duck to eat cow meat.

The cross was removed from the tombstones in Transylvania. Certainly not because of Nintendo's content guidelines. Nope.

This xenomorph-snake looking thing was changed to resemble an alien that appeared on the show. And possibly because its animation looks obscene.

Dialogue Changes
All of the game's dialogue was changed, both to take advantage of the game's bigger dialogue boxes, and to fix some odd-sounding text.

General
The start of the dialogue fixing. Launchpad incorrectly says "Uncle Scrooge" rather than "Mr. McD." in the prototype. This error made it into the final version of DuckTales 2, interestingly enough.

A lot of the text changes were done to make the dialogue snappier.

The Amazon
Dialogue adjusted to account for the new money values. A period was added after the Yes option.

Dewey's hint was changed from being incomprehensible to just obvious.

Transylvania
Webby is a lot more polite about Huey's rescue from a dangerous criminal in the prototype.

Huey, traumatized by the kidnapping, forgets to call the player "Uncle Scrooge" in the prototype. His dialogue was also compressed a bit.

African Mines
Louie keyblocks Scrooge. He bizarrely refers to the mine as a "house" in the prototype, and the dialogue is less certain as to the location of the key.

The final version rewrites Uncle Scrooge's dialogue so that it's no longer in the first-person.

Do or do not, there is no try.

The Himalayas
In addition to the usual dialogue compression, Bubba's name was corrected from "Bubba Duck".

Bubba lost most of his brain cells in the final.

The Moon
Dialogue compression.

Gizmoduck is not named "Roboduck", so this was fixed. The remote control goes from being stolen to just lost.

Another first-person dialogue rewrite.

First-person dialogue + "Roboduck" = Bad. One of Scrooge's catchphrases was also snuck in.

Last Level
The last of the dialogue compression.

Interestingly, the first-person dialogue was retained this time. Another one of Scrooge's catchphrases was also snuck in.

Unused
Even this unused, typo-laden dialogue string was rewritten, changing "prsent" to "a gift", and "Terra Fermics" to "Terra Fermies".

Endings
The different endings were rewritten as well.

Scrooge becomes the richest duck in the prototype, but he's already is in the final. The misspelling "monney" was also fixed. This applies to the other two endings, as well.

The five main treasures get bumped to legendary status in the final.

The bad ending. Apparently the five treasures weren't good enough for the world in the final version. Stupid world. The final version actually introduces a typo, "looses".

The prototype's ending dialogue was completely rewritten. I WONDER WHY.