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I believe, according to the AP Stylebook, that leaving the comma out before "and" in a series is acceptable--most likely in an effort to save space and trouble typesetting in newspapers years ago.
The thing that bugs me is the use of "none" as a plural pronoun. None is a singular pronoun. For instance, it should be "none of the dogs has fleas" not "none of the dogs have fleas." However, the abuse of the word is so widespread that eventually it will be ok to use it for both. Same deal with "irregardless." At some point in the future there will be no rules at all.
I brace when I hear the "I could care less" misonmer, too.