Not Very Consistent
You’d think that someone as professional and well-known as James Gunn would try and keep the script as true to the originals as possible. However, even James isn’t above telling the world where he comes from in his movies, even at the expense of consistency. Shame, shame, shame, but we don’t really care, to be frank.
According to the Marvel comic books, Peter Quill is originally from Colorado. However, during the opening scenes of Guardians of the Galaxy, it clearly states that he comes from Missouri. James also comes from Missouri, which is probably the only cool thing to come out of the state.