The amusement park scenes in that movie were actually filmed here (not 'here' at the bank, but 'here' in this town
) and they used a lot of local college & high school kids as extras.
Haven't read through this thread, but I think most all of that movie was done at the theme park with some of downtown used as well...and it's supposed to be a small town in CA...talk about extreme ends of the continent!
I remember some of the pictures in the papers during auditions...it was pretty funny watching people try to be a zombie.