Regarding Pam, Jim and Roy

I have a question that I can't seem to find the answer to (or may not have looked very hard).

If we assume that The Office is a documentary that is aired on TV and the characters watch the show, how come Roy never knew that Pam and Jim kissed? I mean if you were on TV you would watch yourself wouldn't you?

Just watching the second Christmas special of the UK version on the telly, and there is a moment when a man introduces David as "From TV's "The Office", David Brent!" (or something along those lines..)