Picasso’s Comments (group member since Feb 19, 2017)

Picasso’s comments from the Goodreads Developers group.

Well, I think the API just does not support retrieving all (or say the first X) reviews of a given book or of a given review ID for that matter.
One possible solution would be scraping the reviews page for a given book ID... but it is definitely not robust and depending on your intentions with the data, Goodreads/Amazon might not be ok with it.