There were three little Easter Eggs involved with Summer Falls with the first having new companion Jenna-Louise Coleman stating that the eleventh chapter is the best and "you'll cry your eyes out," obviously referring to the 11th Doctor Who Matt Smith's own chapter as the Timelord.
The second happens to be the author of the book as it is written by Amelia Williams, with "Williams" being Amy Pond's married name i.e. Rory's last name.
The cover also features the trio.
As Cosmic Book News reported on earlier, Summer Falls is an actual book and is now available.
Details include that it was written in 1954 by Amy, which ties into last season's finale with The Ponds getting sent back in time by the Weeping Angel.
See more below.
Written in 1954, Summer Falls is set in the seaside village of Watchcombe, where young Kate is determined to make the most of her last week of summer holiday. But when she discovers a mysterious painting entitled ‘The Lord of Winter’ in a charity shop, it leads her on an adventure she never could have planned.
Kate soon realises the old seacape, painted long ago by an eccentric local artist, is actually a puzzle. And with the help of some bizarre new acquaintances – including a museum curator's magical cat, a miserable neighbour, and a lonely boy – she plans on solving it.
And then, one morning Kate wakes up to a world changed forever. For the Lord of Winter is coming – and Kate has a very important decision to make. “When summer falls, the Lord of Winter will arise...”