In the case of printed RAF badges the material is relatively thick compared to, say, army formation badges. The latter are often colours printed on a thin white cloth and there is an element of bleed through. But RAF printed badges, as with army shoulder titles, tend to be on a thicker/stiffer black backed fabric, with a coloured print over a backing colour. The only RAF Regiment title I've seen where both colours have been printed on a white thin backing cloth have been a variety produced in India (with matching shoulder eagles) and the style is noticeably different.
You're perfectly right regarding errors etc, but in the case of the RAF Regiment title (can't speak for the rest) not only is the construction unlike any other British made printed RAF badge of the period, but the colours?? That's a big error!
