The scene is a bookstore, present day earth etc, nothing to hint that its parallel or anything spooky... and an author called Verity Newman is signing her book: A Journal of Impossible Things.
The Doctor has a short conversation with Verity, similar to that with Gewn Cooper in Journey's End.
The book is a modern hardback with a purple cover featuring a fob watch design.
Recognise who's playing Verity? Jessica Hynes who played Joan Redfern in Human Nature/Family Of Blood. I am guessing that Verity Newman is Joan's granddaughter and inherited John Smith's Journal of Impossible Things from Joan Hmmm....