great that Chang Mai immi office posts this info. Every time I apply at Jomtien there are numerous farangs that don't know what docs they need. I've always thought it would be better for farangs--and office personnel, if they posted signs with docs needed for the various visas/extensions. I know you can find it online but seems a lot of people can't find the info they need online.
Jai yen yen goes a looong way in this country...Jai lon not so much. If you show them your anger it'll just make things worse. As hard as it is, better to go with the flow.
The office I go to for my extension--not Hua Hin, wouldn't accept a Google map of my address, they wanted a hand drawn map, which it states on that document Tod Daniels posted.