" Yep, I assume you're writing in American English; it lets the reader know the "mistakes" in the quote are actually correct in that context.
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"[sic]": square brackets for an interpolation, and the Latin word sic, "thus, this way." (Since it's a foreign word, it's always in italics; since it's a whole word and not an abbreviation, it gets no period.) It amounts to saying, "It really i