Other mistake: This is only seen when you are playing Blaze. When Sonic and Blaze are talking halfway through their battle against one another, Sonic's speech bubbles say 'I admire your fortitude but Carrying the entire world on your shoulders?' but he is halfway through a sentence, so the second speech bubble shouldn't have a capital c.
Other mistake: At the back of the box there is a typing error. It says "Includes wireless play and new a mysterious female companion created exclusively for Sonic Rush!", but it's supposed to be "a new mysterious female companion".