In this sentence:
This book comes three years after the verdict, and Mason says after lots of prodding from publishers.
are commas missing around "Mason says"?
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Mason says is clearly a parenthetical comment identifying the source of the second clause, which is a parallel construction informing us that "The book comes after lots of prodding from publishers."
Actually I think it would read better if the entire second clause were parenthesized and "Mason says" offset in commas, thus:
The book comes three years after the verdict (and, Mason says, after lots of prodding from publishers).