- The Other Darrin:
- What Could Have Been: There's so much cut content, the World of Cars wiki has an entire page dedicated to it.
- Various NPC racers such as Mia (and by extension, Tia), Fletcher, Philip, Yuri, Lenny, Snot Rod, Judd, Buford, Lewis, and former playable racers Sheriff and Count Spatula all have playable data for races and minigames, hinting that they may have been intended to be playable at one point or another. Snot Rod also appears in the intro movie being driven from the player's perspective, lending further credence to this theory.
- Gudmund and Koji were originally called Sven and Hiro, respectively.
- Tommy Joe, Fred, Philip, Yuri, Emma and Snot Rod may have been intended to drive around on the story mode maps, if the unused voice clips involving them greeting Lightning are any indication.
Trivia / Cars: Mater-National Championship