Either is fine: "eg" or "e.g." Periods in abbreviations that are so readily understood are becoming obsolete, or at least optional.

I don't see "eg." much, with just one period, and if I did, I'd probably assume it was a typo or error.

Very curious. I see what you mean. I was about to say it's not *strictly* true; for example, you can ask "Will you be long?" or "Will you be there for long?" But on reflection, "long" is still a negative in both questions, almost as if "long" really means "too long."

So yeah, interesting observation. But I have no clue as to the answer. :p

Yeah, you're spot on about the ambiguity of my rendering. "Officials of Bobby Thompson (Rutter)" it is.

"Hey, everyone," would be common. Whether the singular-plural distinction always requires separate grammatical forms in this context is debatable. There are all kinds of ways we communicate these distinctions, e.g. body language, eye contact etc.