There was an incredibly easy way around the SPOILERS. Every time someone asked River about the Doctor, she should have written it down, shown the person the bit of paper and then leafed it in the FORBIDDEN BOOK.
The same principle applies to the next episode, but hey, Moffat writes cliche fanfic here: paper thin plot to showcase a brilliant idea.
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There was an incredibly easy way around the SPOILERS. Every time someone asked River about the Doctor, she should have written it down, shown the person the bit of paper and then leafed it in the FORBIDDEN BOOK.
The same principle applies to the next episode, but hey, Moffat writes cliche fanfic here: paper thin plot to showcase a brilliant idea.