Chronoverse simply adopted our English method of AD and BC to make things seem more relative and "real world" like. If somebody mentions that an event took place in 12,000 BC, you know it's prehistoric. But if they mention that it happened in 1 AFZ (After the Fall of Zeal), people would get confused. Sort of like how in LotR, they have all the different ages, and the same with the Islamic and Jewish calendars. It can get quite confusing. Besides, how hard would it be to bring a camera back in time on board the Epoch and then film the wedding? And film gets scratchy because the quality of the tape degrades, not because of the camera. Digital is the way to go.
As for the meaning behind bromide.. it's most common use is as the anion of bromine. Which I doubt has anything to do with Chrono Trigger. It can also mean a cliche that's been killed, or a boring person. None of these seem to relate to the game at all. I like the theory of the XXX content and the perverted old man.