The original flash launcher of the game, shown while the game was downloading, included an animation about how the cogs were made.

The story was that Scrooge McDuck visited Gyro Gearloose but didn't find him at home, he then found a robot and tried to repair it to make a profit, the robot in turn then created the cogs with another machine found within the lab.

There is an unused animation of a cog's feet walking away after the body is blown up.

There is an unused animation for an attack where a cog smokes what would likely have been a cigar.

The Japanese version replaces the noises that accompany text dialogue with full voice acting which reads out the dialogue.

There is an extended version of the crying emotion sound never used in the game.

Prior to 2007 when they were changed to green, Toons originally had orange name tags.

During the game's beta, a character's Toon Laff could only go up to 100.

During the beta of Toontown, Donald Duck wore his normal sailor outfit instead of his pajamas in Donald's Dreamland, and was not sleepwalking.

During the game's beta, there was a glitch that allowed Toons to have colored gloves. However, performing the glitch would have the user's account terminated.

Goofy could be found in Daisy Gardens until the gardening and racing activities were released.

During the game's Beta, cogs were called "The Suits".

Photo Fun, a mini-game that appeared within the trolley, was removed in February 2011. It was removed due to a bug that would cause the game to crash on most Mac computers. The files for the mini-game can still be found within the game's data.

An unused animation of a lured Cog, depicting it moving left and right, can be found in the game's files.