It's a MOVIE....not a documentary and, as such, not subject to accuracy but rather creative license. This was a very entertaining way to spend an hour and forty minutes. Dave DeHaan is incredibly convincing as Billy the Kid- and his portrayal of a conflicted, very young man might just be the most accurate part of the movie and it works. Again, if you're looking for accuracy, go to the History Channel. If you're looking for entertainment, you found your movie.