I know in California, even if you dont have a filing requirement, there still lots of people that CA expects to file a return.

If you have any type of state issued license (nursing, cosmetology, security guard, etc) CA expects a tax return even if you had zero income. 

If you have a mortgage on a home located in CA, the FTB wants a tax return.

So I wouldnt rely on the $$ filing requirements completely when deciding whether to file a return or not..