A minigame about collecting Bonus Points in the main town to get more fans to follow you was never added into the game.
There was only one type of car. They all were orange and didn't had eyes and mouth and the racing surface was very basic. The map showed other racers far from the track. This was probably a very early stage of the game.
There was a different surface, where the map was on the top right corner, looking like consoles games map, and would also consider AI locations, unlike the final version, where only user players could be located. There were three colors to identify players, red (for users), green (friends), and blue (the player).
Radiator Springs residents could be seen driving around. In the final version only Red and Doc had this feature.
There were cones in the main street. The purpose for this is unknown.
Red and Radiator Springs were poorly made. Red was missing details, and Radiator Springs had only one generic building replacing all the original buildings from the town (probably very early stages of the game). Cozy Cone Motel didn't have the fountain, and players could drive on the grass unlike the final version of the game.
Colors that were never added into the final version were seen during the trailer.
Some avatars didn't have a number, as sponsors replaced them.
Tractors model were different, and they didn't had sounds, instead they would write their actions ("Zzzzzzzz...").
Some never released features for the backyard were seen. You could have a bigger editor, where you could add Radiator Springs buildings, make your backyard bigger, add roads and more.
The domain was "www.worldofcars.com", but in the final version the site's domain was changed to "worldofcars.go.com".
Ornament Valley was shown in the trailer to be another explorable area, but it was never added into the game.
Races had leaderboards, each one different, depending on the track and difficulty chosen. There was a "Fastest Today" leaderboard, that was refreshing after 1 hour. And on the top appeared the "#1 All Time". Leaderboard only considered the fastest time in the full race.
Twistin' Tailfin Track was locked. The only way to unlock it was using a race code, which could be found in Mattel Die-casts from the Race-O-Rama series, in the back of the tickets with the name of the car. Some race codes were all the same, depending on the car you bought.