Charlie,

the stray click or pop

You can edit those out manually with the pencil tool, but it's a nuisance.
Your best bet is to select a small region around the click and use either
the SF Click and Crackle remover, or the built-in Smooth tool. If you
highlight JUST the single pop the Smooth tool works quite well.

I'm not sure how best to describe the "buzz" noise.

I'm sure this buzz was always present in the record, but now that you've
removed the other surface noise it's more noticeable. If it's just for a
short duration, again try the Smooth tool.

--Ethan