Look at Mr. Baily's (the manager of Good Burger) name tag throughout the movie. It reads, "Mr. Baily". But in the end credits, Dan Schneider (who plays him) is said to have played Mr. Bailey! So which spelling is the correct one?!
If you've ever worked in fast food, you'd know that name-tags aren't always correct. Sometimes, they're incorrect in some way and it's easier to keep it that way than change it.