When Mitch and Woody trade vehicles, they're wearing the same clothes they wear the next day.
The dress of the stunt double for Allison in the monster truck chase alternates between pink/white and solid dark pink.
Mitch says he was gone half an hour but in the same time frame, Allison and Twig get completely coated in mud, clean up, change clothes, and their hair is perfectly dry by the time he returns.
Mitch agrees to donate his kidney to Woody even though he would have to be tested first to know if he was even a match.