PR it is, but there are a few things to learn as well. Canon had a more in depth view of lens production in a video a few years ago.
Those pajama uniforms made me smile.
Yes. I remember that video. I think they were showing how to put together a 500 4L. I still remember that I was working crazy on a weekend and watching that video was quite a pleasant break.
Final assembly of the cameras appears to be very labor intensive and require skilled and detail oriented workers.