One very common example of dialect differences betweeen British English and Subcontinental English, was discussed here a couple of years ago.

It's a clear example of how pendantry about grammar is a pointless game. The purpose of language is to communicate, not comply with some misbegotton set of rules dreamed up by a bunch of 19th century elitists "as a quick screening test to keep out the vulgar mob, [and] brand those who cannot cope with our bad spelling as bad spellers, and make good spellers feel they are virtuous."

Despite containing several typos that cannot be explained by the authors premise about spelling, that's an interesting take on the illogical, archaic idiosyncrasies of English spelling and the pompous pendants that who persist in perpetuating it. I especially like restraint of the sentence: "Only a few readers are repelled - an interesting elite to study."