Hi Mubashar Mirza
First Congratulation on getting the interview. With regards to bvring proof of communication, yes they do see the proofs. My spouse had the interview and they asked for the same proof, they do go over it but they do not go one by one. With the pics, they do ask the relationship who they are and how many people were invited and so on.
They also asked for the forms again just as a formality.
Reason they ask for passport size photos, is because if you pass the interview, and medical results are received and PCC is available, they will issue the visa right away on the spot and also will give u ur landing papers which willhave one photograph of yours on it also
IF there is no change in ur application, don't make a copy, just putt the same information on those new updated forms,
For pics, bring what ever you have along with the new ones
Reason they ask spouse number is that if they are in canada they might call them and if they are present they might ask her questions, but first they will take ur interview and if they feel necessary, they will call your wife
So all the best. You will pass it
From the forum, I know who went thru the interview pass them comfortable and got visa on the spot for majority of the applicants
Thanks