Revealing mistake: Right after McQueen asks what the Ghostlight is, it cuts back to the other cars. Luigi is right next to the firetruck and some gas pumps. The firetruck's door is very reflective, and the gas pumps are visible in it. But Luigi is right by the pump, and he is not reflected in the firetruck's door. (00:02:10)
Revealing mistake: During the final race, Wrangler is shown knocking a yellow car off the race course. A few seconds before this, there are two shots from behind Wrangler, that are just still frames. The shot does not show Wrangler driving or even moving and is completely still. The shot from behind is merely just a still image, that has been extended to last a split second. The same still frame image is also repeated two shots later. (00:27:35)