Is checking the format of a paper an expected part of the reviewing process? I have some papers to review and I am wondering whether I should do an in-depth inspection over the whole paper format? I see nothing major but there might be some tiny format errors here and there.. 



  Does the organizing committee expect reviewers to check submissions
  against the conference format?
I would say the responsibility of the reviewer is to judge the content of the paper. So, checking if the format of the journal/conference has been followed is not part of this job. Very large and obvious deviations can be pointed out, but for example spotting that the font of the caption is in size 11 and not 10 is not part of a reviewers task.