Harvard Novelist Says Copying Was Unintentional
Actually, I'm serious. While the 'mirroring' in the quoted portion goes on for just a little too long, it would only need to be slightly re-written (maybe find something that doesn't include the words 'ha', 'uh' or 'yeah') to make a claim that it was a homage to Megan McCafferty reasonably plausible.
But there's nothing wrong with the "(a), (b)" stuff - after I read The Electric Kool-Aid Acid Test I used Tom Wolfe's triple-colons ( ::: ) loads. So a little bit of trying someone else's techniques on for effect is fine, I reckon.
Followed by: a bit of discussion in the comments of this post.
LATER: Here's a link to the article that broke the story, from the Harvard Crimson
Here's a big list of similarities, also from the Crimson.