Jaime tried to escape from Riverrun in the books too (aided by his cousin, who returned with impostors among his guard). the show version was different, but just as good (actually better, IMO).

as far as including the important parts of the book, they should be able to pull it off in three more episodes:

- Jon Snow killing Qhorin and joining the Wildings
- House of the Undying (Episode 8)
- Arya's final wish from Jaqen, and her escape from Harrenhal
- Tywin Lannister leaves Harrenhal (Episode 8/9)
- Battle of Blackwater Bay (Episode 9)
- Theon (Episodes 8/9/10)
- Bran and Co. (Episode 8/10)
- Dany leaves Qarth (Episode 10)

those are just guesses, but leaving some room in episode 10 to summarize the events of King's Landing, and they're good. in fact, there will be a few parts of A Sword of Swords included in the end as well -- the writers have insisted from now on, each season will not be a 1:1 with the corresponding book, but a continuation of the larger story.