For the record, I am not the first one to suspect that Berg was Moore's undercover cameraman. Here's a post discussing the issue and pointing out that before Berg's death, Moore claimed that he had two undercover cameramen:
http://www.freerepublic.com/focus/f-news/1144239/posts
And at Cannes he said he had THREE...
(see my post early on this thread...post #25, I think)