The one about "What word(s) do you use to refer to a group of two or more people" is missing an option or two. I often use "you lot" or "you kids". To be fair, the latter is more of a joking thing, like parting from a group and saying "you kids be good" or whatever.

The "you lot" bit is, I'm pretty sure, something I picked up from watching British television. Most people in my neck of the woods say "you all" or "y'all". Some use "you'uns".