I had exactly the same concerns as you before I did my Air Law a couple of weeks ago. I think it's best just to be aware of the pinks in general and I didn't read LASORS or any of the other external docs. A quick word with your instructor should put your mind at rest.
Certainly the exam didn't contain any questions on what doc number something was in (other than JAR-FCL 1/2/3) or detailed questions on the content of those external docs that wasn't covered in the training book (Air Pilot's Manual in my case).
As I've said elsewhere, I found PPL Perfector book to be a very good representation of the exam paper.
Good luck, let us know how you get on.