Lucy has been described, and has self-identified, as a fussbudget before, but I think here it's starting to become a defining attribute. I think a lot of people's impressions of the characters originated from the early collections (some of which I read as a kid in first grade -- I devoured all their Fawcett Peanuts collections), and we're just starting to get to the era where strips would frequently be drawn from for those reprints. That's the era that started frequently referring to Lucy as a fussbudget, so they would come to figure prominently in perceptions of the character.
The paddleball bit with Charlie Brown is a wholly unnecessary, but nice, touch.
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