[webstersII]

"Demonstrating two pernicious public school innovations in English. Loose-lose seems to have been cleared up so now there is serious-series and Hugh-huge."

You have only scanned the tip of the iceberg here. You are probably aware of the following, also:
there -- their
your -- you're
its -- it's

The above combinations are used interchangably as though they are equivalent. And one other comes to mind, the use of the word "unique" as though there are degrees of "unique-ness".

Ain't public school grand?

[arthurus]

there -- their
your -- you're
its -- it's

Alas, those are perenniel and at least, sometimes, are due to hasty keyboarding- typos.

[Petruchio]

But, after Clinton, I am constantly confused as to which "is" I am supposed to use.