Deliberate mistake: When Ralph and Vanellope are practicing driving, Vanellope loses one of her upper teeth. The tooth magically reappears again for the rest of the movie. Most noticeable when Ralph rescues her from the dungeon and twice noticeable when she is doing the race. First when she says "I'm gonna win" before starting the race and second when she overtakes King Candy and is in the following tunnel.
Picture added by Casual Person
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