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I occasionally accidentally flag and unflag... I didn't expect to find 30 accidental flags there.

I think it'd be great for the flag button to show a confirmation popup before actually flagging.

The same goes for upvotes. I'm never really sure whether I actually upvoted or accidentally downvoted a comment. This is bad UI.

Yeah, same.

There's an adjacent option to undo a vote, which will say "unvote" or "undown" depending on which way the vote went.

Designwise that's maybe not ideal, sure. But it is discoverable, consistent, and reliable, which in my view counts for more.

Definitely. Turns out I have about two accidental flags a year.